Q| arith                               |  Arithmetic quantities                                                         
S| arith.diff                          |  Difference between two quantities described by the same UCD                   
P| arith.factor                        |  Numerical factor                                                              
P| arith.grad                          |  Gradient                                                                      
P| arith.rate                          |  Rate (per time unit)                                                          
S| arith.ratio                         |  Ratio between two quantities described by the same UCD                        
S| arith.squared                       |  Squared quantity                                                              
S| arith.sum                           |  Summed or integrated quantity                                                 
S| arith.variation                     |  Generic variation of a quantity                                               
Q| arith.zp                            |  Zero point                                                                    
S| em                                  |  Electromagnetic spectrum                                                      
S| em.IR                               |  Infrared part of the spectrum                                                 
S| em.IR.J                             |  Infrared between 1.0 and 1.5 micron                                           
S| em.IR.H                             |  Infrared between 1.5 and 2 micron                                             
S| em.IR.K                             |  Infrared between 2 and 3 micron                                               
S| em.IR.3-4um                         |  Infrared between 3 and 4 micron                                               
S| em.IR.4-8um                         |  Infrared between 4 and 8 micron                                               
S| em.IR.8-15um                        |  Infrared between 8 and 15 micron                                              
S| em.IR.15-30um                       |  Infrared between 15 and 30 micron                                             
S| em.IR.30-60um                       |  Infrared between 30 and 60 micron                                             
S| em.IR.60-100um                      |  Infrared between 60 and 100 micron                                            
S| em.IR.NIR                           |  Near-Infrared, 1-5 microns                                                    
S| em.IR.MIR                           |  Medium-Infrared, 5-30 microns                                                 
S| em.IR.FIR                           |  Far-Infrared, 30-100 microns                                                  
S| em.UV                               |  Ultraviolet part of the spectrum                                              
S| em.UV.10-50nm                       |  Ultraviolet between 10 and 50 nm EUV extreme UV                               
S| em.UV.50-100nm                      |  Ultraviolet between 50 and 100 nm                                             
S| em.UV.100-200nm                     |  Ultraviolet between 100 and 200 nm FUV Far UV                                 
S| em.UV.200-300nm                     |  Ultraviolet between 200 and 300 nm NUV near UV                                
S| em.X-ray                            |  X-ray part of the spectrum                                                    
S| em.X-ray.soft                       |  Soft X-ray (0.12 - 2 keV)                                                     
S| em.X-ray.medium                     |  Medium X-ray (2 - 12 keV)                                                     
S| em.X-ray.hard                       |  Hard X-ray (12 - 120 keV)                                                     
Q| em.bin                              |  Channel / instrumental spectral bin coordinate (bin number)                   
Q| em.energy                           |  Energy value in the em frame                                                  
Q| em.freq                             |  Frequency value in the em frame                                               
Q| em.freq.cutoff                      |  cutoff frequency                                                              
Q| em.freq.resonance                   |  resonance frequency                                                           
S| em.gamma                            |  Gamma rays part of the spectrum                                               
S| em.gamma.soft                       |  Soft gamma ray (120 - 500 keV)                                                
S| em.gamma.hard                       |  Hard gamma ray (>500 keV)                                                     
S| em.line                             |  Designation of major atomic lines                                             
S| em.line.HI                          |  21cm hydrogen line                                                            
S| em.line.Lyalpha                     |  H-Lyalpha line                                                                
S| em.line.Halpha                      |  H-alpha line                                                                  
S| em.line.Hbeta                       |  H-beta line                                                                   
S| em.line.Hgamma                      |  H-gamma line                                                                  
S| em.line.Hdelta                      |  H-delta line                                                                  
S| em.line.Brgamma                     |  Bracket gamma line                                                            
S| em.line.CO                          |  CO radio line, e.g. 12CO(1-0) at 115GHz                                       
S| em.line.OIII                        |  [OIII] line whose rest wl is 500.7 nm                                         
S| em.mm                               |  Millimetric/submillimetric part of the spectrum                               
S| em.mm.30-50GHz                      |  Millimetric between 30 and 50 GHz                                             
S| em.mm.50-100GHz                     |  Millimetric between 50 and 100 GHz                                            
S| em.mm.100-200GHz                    |  Millimetric between 100 and 200 GHz                                           
S| em.mm.200-400GHz                    |  Millimetric between 200 and 400 GHz                                           
S| em.mm.400-750GHz                    |  Millimetric between 400 and 750 GHz                                           
S| em.mm.750-1500GHz                   |  Millimetric between 750 and 1500 GHz                                          
S| em.mm.1500-3000GHz                  |  Millimetric between 1500 and 3000 GHz                                         
S| em.opt                              |  Optical part of the spectrum                                                  
S| em.opt.U                            |  Optical band between 300 and 400 nm                                           
S| em.opt.B                            |  Optical band between 400 and 500 nm                                           
S| em.opt.V                            |  Optical band between 500 and 600 nm                                           
S| em.opt.R                            |  Optical band between 600 and 750 nm                                           
S| em.opt.I                            |  Optical band between 750 and 1000 nm                                          
S| em.pw                               |  Plasma waves (trapped in local medium)                                        
S| em.radio                            |  Radio part of the spectrum                                                    
S| em.radio.20MHz                      |  Radio below 20 MHz                                                            
S| em.radio.20-100MHz                  |  Radio between 20 and 100 MHz                                                  
S| em.radio.100-200MHz                 |  Radio between 100 and 200 MHz                                                 
S| em.radio.200-400MHz                 |  Radio between 200 and 400 MHz                                                 
S| em.radio.400-750MHz                 |  Radio between 400 and 750 MHz                                                 
S| em.radio.750-1500MHz                |  Radio between 750 and 1500 MHz                                                
S| em.radio.1500-3000MHz               |  Radio between 1500 and 3000 MHz                                               
S| em.radio.3-6GHz                     |  Radio between 3 and 6 GHz                                                     
S| em.radio.6-12GHz                    |  Radio between 6 and 12 GHz                                                    
S| em.radio.12-30GHz                   |  Radio between 12 and 30 GHz                                                   
Q| em.wavenumber                       |  Wavenumber value in the em frame                                              
Q| em.wl                               |  Wavelength value in the em frame                                              
Q| em.wl.central                       |  Central wavelength                                                            
Q| em.wl.effective                     |  Effective wavelength                                                          
Q| instr                               |  Instrument                                                                    
E| instr.background                    |  Instrumental background                                                       
Q| instr.bandpass                      |  Bandpass (e.g.: band name) of instrument                                      
Q| instr.bandwidth                     |  Bandwidth of the instrument                                                   
Q| instr.baseline                      |  Baseline for interferometry                                                   
S| instr.beam                          |  Beam                                                                          
Q| instr.calib                         |  Calibration parameter                                                         
S| instr.det                           |  Detector                                                                      
Q| instr.det.noise                     |  Instrument noise                                                              
Q| instr.det.psf                       |  Point Spread Function                                                         
Q| instr.det.qe                        |  Quantum efficiency                                                            
Q| instr.dispersion                    |  Dispersion of a spectrograph                                                  
Q| instr.experiment                    |  Experiment or group of instruments                                            
S| instr.filter                        |  Filter                                                                        
S| instr.fov                           |  Field of view                                                                 
S| instr.obsty                         |  Observatory, satellite, mission                                               
Q| instr.obsty.seeing                  |  Seeing                                                                        
Q| instr.offset                        |  Offset angle respect to main direction of observation                         
Q| instr.order                         |  Spectral order in a spectrograph                                              
Q| instr.param                         |  Various instrumental parameters                                               
S| instr.pixel                         |  Pixel (default size: angular)                                                 
S| instr.plate                         |  Photographic plate                                                            
Q| instr.plate.emulsion                |  Plate emulsion                                                                
Q| instr.precision                     |  Instrument precision                                                          
Q| instr.rmsf                          |  Rotation Measure Spread Function                                              
Q| instr.saturation                    |  Instrument saturation threshold                                               
Q| instr.scale                         |  Instrument scale (for CCD, plate, image)                                      
Q| instr.sensitivity                   |  Instrument sensitivity, detection threshold                                   
Q| instr.setup                         |  Instrument configuration or setup                                             
Q| instr.skyLevel                      |  Sky level                                                                     
Q| instr.skyTemp                       |  Sky temperature                                                               
Q| instr.tel                           |  Telescope                                                                     
Q| instr.tel.focalLength               |  Telescope focal length                                                        
S| instr.voxel                         |  Related to a voxel (n-D volume element with n>2)                              
P| meta                                |  Metadata                                                                      
P| meta.abstract                       |  Abstract (of paper, proposal, etc.)                                           
P| meta.bib                            |  Bibliographic reference                                                       
P| meta.bib.author                     |  Author name                                                                   
P| meta.bib.bibcode                    |  Bibcode                                                                       
P| meta.bib.fig                        |  Figure in a paper                                                             
P| meta.bib.journal                    |  Journal name                                                                  
P| meta.bib.page                       |  Page number                                                                   
P| meta.bib.volume                     |  Volume number                                                                 
Q| meta.calibLevel                     |  Processing/calibration level                                                  
P| meta.code                           |  Code or flag                                                                  
P| meta.code.class                     |  Classification code                                                           
P| meta.code.error                     |  Limit uncertainty error flag                                                  
P| meta.code.member                    |  Membership code                                                               
P| meta.code.mime                      |  MIME type                                                                     
P| meta.code.multip                    |  Multiplicity or binarity flag                                                 
P| meta.code.qual                      |  Quality, precision, reliability flag or code                                  
P| meta.code.status                    |  Status code (e.g.: status of a proposal/observation)                          
P| meta.cryptic                        |  Unknown or impossible to understand quantity                                  
P| meta.curation                       |  Identity of man/organization responsible for the data                         
Q| meta.dataset                        |  Dataset                                                                       
Q| meta.email                          |  Curation/contact e-mail                                                       
S| meta.file                           |  File                                                                          
S| meta.fits                           |  FITS standard                                                                 
P| meta.id                             |  Identifier, name or designation                                               
P| meta.id.assoc                       |  Identifier of associated counterpart                                          
P| meta.id.CoI                         |  Name of Co-Investigator                                                       
P| meta.id.cross                       |  Cross identification                                                          
P| meta.id.parent                      |  Identification of parent source                                               
P| meta.id.part                        |  Part of identifier, suffix or sub-component                                   
P| meta.id.PI                          |  Name of Principal Investigator or Co-PI                                       
S| meta.main                           |  Main value of something                                                       
S| meta.modelled                       |  Quantity was produced by a model                                              
P| meta.note                           |  Note or remark (longer than a code or flag)                                   
P| meta.number                         |  Number (of things; e.g. nb of object in an image)                             
P| meta.record                         |  Record number                                                                 
S| meta.preview                        |  Related to a preview operation for a dataset                                  
Q| meta.query                          |  A query posed to an information system or database or a property of it        
P| meta.ref                            |  Reference or origin                                                           
P| meta.ref.doi                        |  DOI identifier (dereferenceable)                                              
P| meta.ref.ivoid                      |  Related to an identifier as recommended in the IVOA (dereferenceable)         
P| meta.ref.uri                        |  URI, universal resource identifier                                            
P| meta.ref.url                        |  URL, web address                                                              
S| meta.software                       |  Software used in generating data                                              
S| meta.table                          |  Table or catalogue                                                            
P| meta.title                          |  Title or explanation                                                          
Q| meta.ucd                            |  UCD                                                                           
P| meta.unit                           |  Unit                                                                          
P| meta.version                        |  Version                                                                       
S| obs                                 |  Observation                                                                   
Q| obs.airMass                         |  Airmass                                                                       
S| obs.atmos                           |  Atmosphere, atmospheric phenomena affecting an observation                    
Q| obs.atmos.extinction                |  Atmospheric extinction                                                        
Q| obs.atmos.refractAngle              |  Atmospheric refraction angle                                                  
S| obs.calib                           |  Calibration observation                                                       
S| obs.calib.flat                      |  Related to flat-field calibration observation (dome, sky, ..)                 
S| obs.calib.dark                      |  Related to dark current calibration                                           
S| obs.exposure                        |  Exposure                                                                      
S| obs.field                           |  Region covered by the observation                                             
S| obs.image                           |  Image                                                                         
Q| obs.observer                        |  Observer, discoverer                                                          
S| obs.occult                          |  Observation of occultation phenomenon by solar system objects                 
S| obs.transit                         |  Observation of transit phenomenon  : exo-planets                              
Q| obs.param                           |  Various observation or reduction parameter                                    
S| obs.proposal                        |  Observation proposal                                                          
Q| obs.proposal.cycle                  |  Proposal cycle                                                                
S| obs.sequence                        |  Sequence of observations, exposures or events                                 
E| phot                                |  Photometry                                                                    
E| phot.antennaTemp                    |  Antenna temperature                                                           
Q| phot.calib                          |  Photometric calibration                                                       
C| phot.color                          |  Color index or magnitude difference                                           
Q| phot.color.excess                   |  Color excess                                                                  
Q| phot.color.reddFree                 |  Dereddened color                                                              
E| phot.count                          |  Flux expressed in counts                                                      
E| phot.fluence                        |  Radiant photon energy received by a surface per unit area or irradiance of a surface integrated over time of irradiation 
E| phot.flux                           |  Photon flux or irradiance                                                     
Q| phot.flux.bol                       |  Bolometric flux                                                               
E| phot.flux.density                   |  Flux density (per wl/freq/energy interval)                                    
E| phot.flux.density.sb                |  Flux density surface brightness                                               
E| phot.flux.sb                        |  Flux surface brightness                                                       
E| phot.limbDark                       |  Limb-darkening coefficients                                                   
E| phot.mag                            |  Photometric magnitude                                                         
E| phot.mag.bc                         |  Bolometric correction                                                         
Q| phot.mag.bol                        |  Bolometric magnitude                                                          
Q| phot.mag.distMod                    |  Distance modulus                                                              
E| phot.mag.reddFree                   |  Dereddened magnitude                                                          
E| phot.mag.sb                         |  Surface brightness in magnitude units                                         
E| phot.radiance                       |  Radiance as energy flux per solid angle                                       
Q| phys                                |  Physical quantities                                                           
Q| phys.SFR                            |  Star formation rate                                                           
E| phys.absorption                     |  Extinction or absorption along the line of sight                              
Q| phys.absorption.coeff               |  Absorption coefficient (e.g. in a spectral line)                              
Q| phys.absorption.gal                 |  Galactic extinction                                                           
Q| phys.absorption.opticalDepth        |  Optical depth                                                           
Q| phys.abund                          |  Abundance                                                                     
Q| phys.abund.Fe                       |  Fe/H abundance                                                                
Q| phys.abund.X                        |  Hydrogen abundance                                                            
Q| phys.abund.Y                        |  Helium abundance                                                              
Q| phys.abund.Z                        |  Metallicity abundance                                                         
Q| phys.acceleration                   |  Acceleration                                                                  
S| phys.aerosol                        |  Relative to aerosol                                                           
Q| phys.albedo                         |  Albedo or reflectance                                                         
Q| phys.angArea                        |  Angular area                                                                  
Q| phys.angMomentum                    |  Angular momentum                                                              
E| phys.angSize                        |  Angular size width diameter dimension extension major minor axis extraction radius     
E| phys.angSize.smajAxis               |  Angular size extent or extension of semi-major axis                           
E| phys.angSize.sminAxis               |  Angular size extent or extension of semi-minor axis                           
Q| phys.area                           |  Area (in surface, not angular units)                                          
S| phys.atmol                          |  Atomic and molecular physics (shared properties)                              
Q| phys.atmol.branchingRatio           |  Branching ratio                                                               
S| phys.atmol.collisional              |  Related to collisions                                                         
Q| phys.atmol.collStrength             |  Collisional strength                                                          
Q| phys.atmol.configuration            |  Configuration                                                                 
Q| phys.atmol.crossSection             |  Atomic / molecular cross-section                                              
Q| phys.atmol.element                  |  Element                                                                       
Q| phys.atmol.excitation               |  Atomic molecular excitation parameter                                         
Q| phys.atmol.final                    |  Quantity refers to atomic/molecular final/ground state, level, etc.           
Q| phys.atmol.initial                  |  Quantity refers to atomic/molecular initial state, level, etc.                
Q| phys.atmol.ionStage                 |  Ion, ionization stage                                                         
S| phys.atmol.ionization               |  Related to ionization                                                         
Q| phys.atmol.lande                    |  Lande factor                                                                  
S| phys.atmol.level                    |  Atomic level                                                                  
Q| phys.atmol.lifetime                 |  Lifetime of a level                                                           
Q| phys.atmol.lineShift                |  Line shifting coefficient                                                     
Q| phys.atmol.number                   |  Atomic number Z                                                               
Q| phys.atmol.oscStrength              |  Oscillator strength                                                           
Q| phys.atmol.parity                   |  Parity                                                                        
Q| phys.atmol.qn                       |  Quantum number                                                                
Q| phys.atmol.radiationType            |  Type of radiation characterizing atomic lines (electric dipole/quadrupole, magnetic dipole)  
Q| phys.atmol.symmetry                 |  Type of nuclear spin symmetry                                                 
Q| phys.atmol.sWeight                  |  Statistical weight                                                            
Q| phys.atmol.sWeight.nuclear          |  Statistical weight for nuclear spin states                                    
Q| phys.atmol.term                     |  Atomic term                                                                   
S| phys.atmol.transition               |  Transition between states                                                     
Q| phys.atmol.transProb                |  Transition probability, Einstein A coefficient                                
Q| phys.atmol.wOscStrength             |  Weighted oscillator strength                                                  
Q| phys.atmol.weight                   |  Atomic weight                                                                 
Q| phys.columnDensity                  |  Column density                                                                
S| phys.composition                    |  Quantities related to composition of objects                                  
Q| phys.composition.massLightRatio     |  Mass to light ratio                                                   
Q| phys.composition.yield              |  Mass yield                                                                    
S| phys.cosmology                      |  Related to cosmology                                                          
Q| phys.damping                        |  Generic damping quantities                                                    
Q| phys.density                        |  Density (of mass, electron, ...)                                              
Q| phys.density.phaseSpace             |  Density in the phase space                                                    
Q| phys.dielectric                     |  Complex dielectric function                                                   
Q| phys.dispMeasure                    |  Dispersion measure                                                            
S| phys.dust                           |  Relative to dust                                                              
V| phys.electField                     |  Electric field                                                                
S| phys.electron                       |  Electron                                                                      
Q| phys.electron.degen                 |  Electron degeneracy parameter                                                 
Q| phys.emissMeasure                   |  Emission measure                                                              
Q| phys.emissivity                     |  Emissivity                                                                    
Q| phys.energy                         |  Energy                                                                        
Q| phys.energy.Gibbs                   |  Gibbs (free) energy or free enthalpy [G=H-TS]                                 
Q| phys.energy.Helmholtz               |  Helmholtz free energy [A=U-TS]                                                
Q| phys.energy.density                 |  Energy density                                                                
Q| phys.enthalpy                       |  Enthalpy [H=U+pv]                                                             
Q| phys.entropy                        |  Entropy                                                                       
Q| phys.eos                            |  Equation of state                                                             
Q| phys.excitParam                     |  Excitation parameter U                                                        
E| phys.fluence                        |  Particle energy received by a surface per unit area integrated over time      
Q| phys.flux                           |  Flux or flow of particle, energy, etc.                                        
Q| phys.flux.energy                    |  Energy flux, heat flux                                                        
Q| phys.gauntFactor                    |  Gaunt factor/correction                                                       
Q| phys.gravity                        |  Gravity                                                                       
Q| phys.ionizParam                     |  Ionization parameter                                                          
Q| phys.ionizParam.coll                |  Collisional ionization                                                        
Q| phys.ionizParam.rad                 |  Radiative ionization                                                          
E| phys.luminosity                     |  Luminosity                                                                    
Q| phys.luminosity.fun                 |  Luminosity function                                                           
E| phys.magAbs                         |  Absolute magnitude                                                            
Q| phys.magAbs.bol                     |  Bolometric absolute magnitude                                                 
V| phys.magField                       |  Magnetic field                                                                
Q| phys.mass                           |  Mass                                                                          
Q| phys.mass.inertiaMomentum           |  Momentum of inertia or rotational inertia                                     
Q| phys.mass.loss                      |  Mass loss                                                                     
Q| phys.mol                            |  Molecular data                                                                
Q| phys.mol.dipole                     |  Molecular dipole                                                              
Q| phys.mol.dipole.electric            |  Molecular electric dipole moment                                              
Q| phys.mol.dipole.magnetic            |  Molecular magnetic dipole moment                                              
Q| phys.mol.dissociation               |  Molecular dissociation                                                        
Q| phys.mol.formationHeat              |  Formation heat for molecules                                                  
Q| phys.mol.quadrupole                 |  Molecular quadrupole                                                          
Q| phys.mol.quadrupole.electric        |  Molecular electric quadrupole moment                                          
S| phys.mol.rotation                   |  Molecular rotation                                                            
S| phys.mol.vibration                  |  Molecular vibration                                                           
S| phys.particle                       |  Related to physical particles                                                 
S| phys.particle.neutrino              |  Related to neutrino                                                           
S| phys.particle.neutron               |  Related to neutron                                                            
S| phys.particle.proton                |  Related to proton                                                             
S| phys.particle.alpha                 |  Related to alpha particle                                                     
S| phys.phaseSpace                     |  Related to phase space                                                        
E| phys.polarization                   |  Polarization degree (or percentage)                                           
Q| phys.polarization.circular          |  Circular polarization                                                         
Q| phys.polarization.linear            |  Linear polarization                                                           
Q| phys.polarization.rotMeasure        |  Rotation measure polarization                                         
Q| phys.polarization.stokes            |  Stokes polarization                                                           
Q| phys.polarization.stokes.I          |  Stokes polarization coefficient I                                             
Q| phys.polarization.stokes.Q          |  Stokes polarization coefficient Q                                             
Q| phys.polarization.stokes.U          |  Stokes polarization coefficient U                                             
Q| phys.polarization.stokes.V          |  Stokes polarization coefficient V                                             
Q| phys.potential                      |  Potential (electric, gravitational, etc)                                      
Q| phys.pressure                       |  Pressure                                                                      
Q| phys.recombination.coeff            |  Recombination coefficient                                                     
Q| phys.refractIndex                   |  Refraction index                                                              
Q| phys.size                           |  Linear size, length (not angular)                                             
Q| phys.size.axisRatio                 |  Axis ratio (a/b) or (b/a)                                                     
Q| phys.size.diameter                  |  Diameter                                                                      
Q| phys.size.radius                    |  Radius                                                                        
Q| phys.size.smajAxis                  |  Linear semi major axis                                                        
Q| phys.size.sminAxis                  |  Linear semi minor axis                                                        
Q| phys.size.smedAxis                  |  Linear semi median axis for 3D ellipsoids                                     
Q| phys.temperature                    |  Temperature                                                                   
Q| phys.temperature.effective          |  Effective temperature                                                         
Q| phys.temperature.electron           |  Electron temperature                                                          
Q| phys.transmission                   |  Transmission (of filter, instrument, ...)                                     
V| phys.veloc                          |  Space velocity                                                                
Q| phys.veloc.ang                      |  Angular velocity                                                              
Q| phys.veloc.dispersion               |  Velocity dispersion                                                           
Q| phys.veloc.escape                   |  Escape velocity                                                               
Q| phys.veloc.expansion                |  Expansion velocity                                                            
Q| phys.veloc.microTurb                |  Microturbulence velocity                                                      
Q| phys.veloc.orbital                  |  Orbital velocity                                                              
Q| phys.veloc.pulsat                   |  Pulsational velocity                                                          
Q| phys.veloc.rotat                    |  Rotational velocity                                                           
Q| phys.veloc.transverse               |  Transverse / tangential velocity                                              
S| phys.virial                         |  Related to virial quantities (mass, radius, ...)                              
Q| phys.volume                         |  Volume (in cubic units)                                                       
Q| pos                                 |  Position and coordinates                                                      
Q| pos.angDistance                     |  Angular distance, elongation                                                  
Q| pos.angResolution                   |  Angular resolution                                                            
Q| pos.az                              |  Position in alt-azimuth frame                                                 
Q| pos.az.alt                          |  Alt-azimuth altitude                                                          
Q| pos.az.azi                          |  Alt-azimuth azimuth                                                           
Q| pos.az.zd                           |  Alt-azimuth zenith distance                                                   
S| pos.barycenter                      |  Barycenter                                                                    
S| pos.bodyrc                          |  Body related coordinates                                                      
Q| pos.bodyrc.alt                      |  Body related coordinate (altitude on the body)                                
Q| pos.bodyrc.lat                      |  Body related coordinate (latitude on the body)                                
Q| pos.bodyrc.lon                      |  Body related coordinate (longitude on the body)                               
S| pos.cartesian                       |  Cartesian (rectangular) coordinates                                           
Q| pos.cartesian.x                     |  Cartesian coordinate along the x-axis                                         
Q| pos.cartesian.y                     |  Cartesian coordinate along the y-axis                                         
Q| pos.cartesian.z                     |  Cartesian coordinate along the z-axis                                         
S| pos.centroid                        |  Related to the centroid of a measure.                                         
S| pos.cmb                             |  Cosmic Microwave Background reference frame                                   
Q| pos.dirCos                          |  Direction cosine                                                              
V| pos.distance                        |  Linear distance                                                               
S| pos.earth                           |  Coordinates related to Earth                                                  
Q| pos.earth.altitude                  |  Altitude, height on Earth  above sea level                                    
Q| pos.earth.lat                       |  Latitude on Earth                                                             
Q| pos.earth.lon                       |  Longitude on Earth                                                            
S| pos.ecliptic                        |  Ecliptic coordinates                                                          
Q| pos.ecliptic.lat                    |  Ecliptic latitude                                                             
Q| pos.ecliptic.lon                    |  Ecliptic longitude                                                            
S| pos.eop                             |  Earth orientation parameters                                                  
Q| pos.ephem                           |  Ephemeris                                                                     
Q| pos.eq                              |  Equatorial coordinates                                                        
Q| pos.eq.dec                          |  Declination in equatorial coordinates                                         
Q| pos.eq.ha                           |  Hour-angle                                                                    
Q| pos.eq.ra                           |  Right ascension in equatorial coordinates                                     
Q| pos.eq.spd                          |  South polar distance in equatorial coordinates                                
S| pos.errorEllipse                    |  Positional error ellipse                                                      
Q| pos.frame                           |  Reference frame used for positions                                            
S| pos.galactic                        |  Galactic coordinates                                                          
Q| pos.galactic.lat                    |  Latitude in galactic coordinates                                              
Q| pos.galactic.lon                    |  Longitude in galactic coordinates                                             
S| pos.galactocentric                  |  Galactocentric coordinate system                                              
S| pos.geocentric                      |  Geocentric coordinate system                                                  
Q| pos.healpix                         |  Hierarchical Equal Area IsoLatitude Pixelization                              
S| pos.heliocentric                    |  Heliocentric position coordinate (solar system bodies)                        
Q| pos.HTM                             |  Hierarchical Triangular Mesh                                                  
S| pos.lambert                         |  Lambert projection                                                            
S| pos.lg                              |  Local Group reference frame                                                   
S| pos.lsr                             |  Local Standard of Rest reference frame                                        
Q| pos.lunar                           |  Lunar coordinates                                                             
Q| pos.lunar.occult                    |  Occultation by lunar limb                                                     
Q| pos.nutation                        |  Nutation (of a body)                                                          
Q| pos.outline                         |  Set of points outlining a region (contour)                                    
Q| pos.parallax                        |  Parallax                                                                      
Q| pos.parallax.dyn                    |  Dynamical parallax                                                            
Q| pos.parallax.phot                   |  Photometric parallaxes                                                        
Q| pos.parallax.spect                  |  Spectroscopic parallax                                                        
Q| pos.parallax.trig                   |  Trigonometric parallax                                                        
Q| pos.phaseAng                        |  Phase angle, e.g. elongation of earth from sun as seen from a third celestial object 
V| pos.pm                              |  Proper motion                                                                 
Q| pos.posAng                          |  Position angle of a given vector                                              
V| pos.precess                         |  Precession (in equatorial coordinates)                                        
S| pos.supergalactic                   |  Supergalactic coordinates                                                     
Q| pos.supergalactic.lat               |  Latitude in supergalactic coordinates                                         
Q| pos.supergalactic.lon               |  Longitude in supergalactic coordinates                                        
P| pos.wcs                             |  WCS keywords                                                                  
P| pos.wcs.cdmatrix                    |  WCS CDMATRIX                                                                  
P| pos.wcs.crpix                       |  WCS CRPIX                                                                     
P| pos.wcs.crval                       |  WCS CRVAL                                                                     
P| pos.wcs.ctype                       |  WCS CTYPE                                                                     
P| pos.wcs.naxes                       |  WCS NAXES                                                                     
P| pos.wcs.naxis                       |  WCS NAXIS                                                                     
P| pos.wcs.scale                       |  WCS scale or scale of an image                                                
Q| spect                               |  Spectroscopy                                                                  
Q| spect.binSize                       |  Spectral bin size                                                             
S| spect.continuum                     |  Continuum spectrum                                                            
Q| spect.dopplerParam                  |  Doppler parameter b                                                           
E| spect.dopplerVeloc                  |  Radial velocity, derived from the shift of some spectral feature              
E| spect.dopplerVeloc.opt              |  Radial velocity derived from a wavelength shift using the optical convention  
E| spect.dopplerVeloc.radio            |  Radial velocity derived from a frequency shift using the radio convention     
E| spect.index                         |  Spectral index                                                                
S| spect.line                          |  Spectral line                                                                 
E| spect.line.asymmetry                |  Line asymmetry                                                                
E| spect.line.broad                    |  Spectral line broadening                                                      
Q| spect.line.broad.Stark              |  Stark line broadening coefficient                                             
E| spect.line.broad.Zeeman             |  Zeeman broadening                                                             
E| spect.line.eqWidth                  |  Line equivalent width                                                         
E| spect.line.intensity                |  Line intensity                                                                
E| spect.line.profile                  |  Line profile                                                                  
Q| spect.line.strength                 |  Spectral line strength S                                                      
E| spect.line.width                    |  Spectral line full width half maximum                                         
Q| spect.resolution                    |  Spectral (or velocity) resolution                                             
S| src                                 |  Observed source viewed on the sky                                             
S| src.calib                           |  Calibration source                                                            
S| src.calib.guideStar                 |  Guide star                                                                    
Q| src.class                           |  Source classification (star, galaxy, cluster, comet, asteroid )               
Q| src.class.color                     |  Color classification                                                          
Q| src.class.distance                  |  Distance class e.g. Abell                                                     
Q| src.class.luminosity                |  Luminosity class                                                              
Q| src.class.richness                  |  Richness class e.g. Abell                                                     
Q| src.class.starGalaxy                |  Star/galaxy discriminator, stellarity index                                   
Q| src.class.struct                    |  Structure classification e.g. Bautz-Morgan                                    
Q| src.density                         |  Density of sources                                                            
Q| src.ellipticity                     |  Source ellipticity                                                            
Q| src.impactParam                     |  Impact parameter                                                              
Q| src.morph                           |  Morphology structure                                                          
Q| src.morph.param                     |  Morphological parameter                                                       
Q| src.morph.scLength                  |  Scale length for a galactic component (disc or bulge)                         
Q| src.morph.type                      |  Hubble morphological type (galaxies)                                          
S| src.net                             |  Qualifier indicating that a quantity (e.g. flux) is background subtracted rather than total 
Q| src.orbital                         |  Orbital parameters                                                            
Q| src.orbital.eccentricity            |  Orbit eccentricity                                                            
Q| src.orbital.inclination             |  Orbit inclination                                                             
Q| src.orbital.meanAnomaly             |  Orbit mean anomaly                                                            
Q| src.orbital.meanMotion              |  Mean motion                                                                   
Q| src.orbital.node                    |  Ascending node                                                                
Q| src.orbital.periastron              |  Periastron                                                                    
Q| src.orbital.Tisserand               |  Tisserand parameter (generic)                                                 
Q| src.orbital.TissJ                   |  Tisserand parameter with respect to Jupiter                                   
Q| src.redshift                        |  Redshift                                                                      
Q| src.redshift.phot                   |  Photometric redshift                                                          
Q| src.sample                          |  Sample                                                                        
Q| src.spType                          |  Spectral type MK                                                              
Q| src.var                             |  Variability of source                                                         
E| src.var.amplitude                   |  Amplitude of variation                                                        
Q| src.var.index                       |  Variability index                                                             
Q| src.var.pulse                       |  Pulse                                                                         
Q| stat                                |  Statistical parameters                                                        
Q| stat.asymmetry                      |  Measure of asymmetry                                                          
P| stat.correlation                    |  Correlation between two parameters                                            
P| stat.covariance                     |  Covariance between two parameters                                             
P| stat.error                          |  Statistical error                                                             
P| stat.error.sys                      |  Systematic error                                                              
Q| stat.filling                        |  Filling factor (volume, time, ...)                                            
Q| stat.fit                            |  Fit                                                                           
P| stat.fit.chi2                       |  Chi2                                                                          
P| stat.fit.dof                        |  Degrees of freedom                                                            
P| stat.fit.goodness                   |  Goodness or significance of fit                                               
S| stat.fit.omc                        |  Observed minus computed                                                       
Q| stat.fit.param                      |  Parameter of fit                                                              
P| stat.fit.residual                   |  Residual fit                                                                  
Q| stat.Fourier                        |  Fourier coefficient                                                           
Q| stat.Fourier.amplitude              |  Amplitude of Fourier coefficient                                              
S| stat.fwhm                           |  Full width at half maximum                                                    
S| stat.interval                       |  Generic interval between two limits (defined as a pair of values)             
P| stat.likelihood                     |  Likelihood                                                                    
S| stat.max                            |  Maximum or upper limit                                                        
S| stat.mean                           |  Mean, average value                                                           
S| stat.median                         |  Median value                                                                  
S| stat.min                            |  Minimum or lowest limit                                                       
Q| stat.param                          |  Parameter                                                                     
Q| stat.probability                    |  Probability                                                                   
P| stat.rank                           |  Rank or order in list of sorted values                                        
P| stat.rms                            |  Root mean square as square root of sum of squared values or quadratic mean    
P| stat.snr                            |  Signal to noise ratio                                                         
P| stat.stdev                          |  Standard deviation as the square root of the variance                         
S| stat.uncalib                        |  Qualifier of a generic uncalibrated quantity                                  
Q| stat.value                          |  Miscellaneous value                                                           
P| stat.variance                       |  Variance                                                                      
P| stat.weight                         |  Statistical weight                                                            
Q| time                                |  Time, generic quantity in units of time or date                               
Q| time.age                            |  Age                                                                           
Q| time.creation                       |  Creation time/date (of dataset, file, catalogue,...)                          
Q| time.crossing                       |  Crossing time                                                                 
Q| time.duration                       |  Interval of time describing the duration of a generic event or phenomenon     
Q| time.end                            |  End time/date of a generic event                                              
Q| time.epoch                          |  Instant of time related to a generic event (epoch, date, Julian date, time stamp/tag,...) 
Q| time.equinox                        |  Equinox                                                                       
Q| time.interval                       |  Time interval, time-bin, time elapsed between two events, not the duration of an event 
Q| time.lifetime                       |  Lifetime                                                                      
Q| time.period                         |  Period, interval of time between the recurrence of phases in a periodic phenomenon 
Q| time.period.revolution              |  Period of revolution of a body around a primary one (similar to year)         
Q| time.period.rotation                |  Period of rotation of a body around its axis (similar to day)                 
Q| time.phase                          |  Phase, position within a period                                               
Q| time.processing                     |  A time/date associated with the processing of data                            
Q| time.publiYear                      |  Publication year                                                              
Q| time.relax                          |  Relaxation time                                                               
Q| time.release                        |  The time/date data is available to the public                                 
Q| time.resolution                     |  Time resolution                                                               
Q| time.scale                          |  Timescale                                                                     
Q| time.start                          |  Start time/date of generic event