The `PLAIT` algorithm ``combine'' two spectra cubes resulting from OTF
observation with orthogonal scanning directions into a single spectra cube.
It works in the Fourier plane and it reduces the striping due to receiver
and atmospheric instabilities which inevitably show up in OTF maps. A
version of this algorithm has been implemented as a **GILDAS** task named
`PLAIT` from a previous version by C.Nieten (itself elaborated on original
ideas from the NOD2 package).

Gildas manager 2014-07-01