The spectra imported from Herschel-HIFI FITS are also one of the firsts to use the so-called Associated Arrays in the CLASS observation. These arrays can be found under the structure R%ASSOC%. CLASS can understand those special arrays (see below where the dedicated documentation can be found). In practice, the Herschel-HIFI spectra provides the usual intensity array (i.e. in the RY variable), but also 2 arrays of the same size (same number of channels):
LAS> LET RY R%HEAD%SPE%BAD /WHERE R%ASSOC%BLANKED%DATA.EQ.1
LAS> SET WINDOW /ASSOCIATED ! Will use the LINE Associated Array LAS> SHOW WINDOW ! Check you will use the LINE Associated Array LAS> DRAW WINDOW ! Draw the LINE Associated Array on the spectrum LAS> BASE ! Use the LINE Associated Array during baselining
Note that the Associated Arrays are removed by the commands
that do not know how to process them. In this case, a warning is
issued. This is being solved as the Associated Arrays are more
and more integrated in CLASS. In order to know the current status,
please check the dedicated documentation for your current CLASS
version in the widget menu Help
CLASS
Associated Arrays.