MODEL

        ANALYSE\MODEL Y_Variable [X_Variable] [/BLANK Bval] [/REGULAR  [Xref
    Xval  RestFreq]]  [/FREQUENCY  LineName RestFreq] [/XAXIS Xref Xval Xinc
    Unit]

    Generates a CLASS spectrum from a 1D SIC  variable.  Note  that  the  1D
    variable  can be (and frequently is) a subset of a higher dimensionality
    variable. This command is typically used either to generate  test  data,
    or  more  frequently  to  transfer data from a GILDAS image (or cube) to
    CLASS.

    A second variable, if present, is interpreted as an  associated  X  axis
    scale for a presumably non linear or irregularly sampled frequency axis,
    as can occur for non resampled data from AOS backends (or optical  spec-
    tra).  Please  note  however that non linear axes are a largely untested
    feature in CLASS, you should avoid this solution when possible.

    There are three (exclusive) ways to define the X axis: provide a  X  ar-
    ray,  /XAXIS  option, /REGULAR option (see below). The model header will
    have a minimal values set. On the other hand, if none of these three  is
    used,  the command will copy RX and header from the previous R buffer in
    memory.

    /BLANK Bval
        Allow the user to provide the blanking value. Default is -1000.

    /REGULAR [Xref Xval RestFreq]
        Indicate that data are regularly spaced along the X axis. If no ref-
        erence pixel and value at reference are supplied, default values are
        set to respectively half the channel number and to the  velocity  in
        the nearest channel.

    /FREQUENCY LineName RestFreq
        Indicate line name and the rest frequency. Default rest frequency is
        3.10^5 MHz.

    /XAXIS Xref Xval Xinc Unit
        Define the X axis with its reference channel (Xref),  its  value  at
        reference  channel  (Xval),  and  the  increment per channel (Xinc).
        Units are km/s or MHz if Unit is VELOCITY or FREQUENCY respectively.
        If Unit is FREQUENCY, Xval is expected to be the rest frequency.