In the previous visualization, the dumped spectra were order according to their observation number, which most often corresponds to the observing time sequence. However, it often happens that two sequential OTF scans belongs to 2 far-away part of the same source. It is thus desirable to be able to sort dumped spectra in the index by coordinates. In CLASS90, the ``set sort keyword'' command defines the sorting that will be applied when the index will be built by the next find command. In particular, the keyword may be lambda or beta. Fig. shows the results of the following commands
LAS90> set mode y 0 8 LAS90> set angle second LAS90> set sort beta LAS90> for ilambda -470 to -260 by 30 LAS90> find /range 'ilambda' 'ilambda+10' * * LAS90> if (found.ne.0) then LAS90> load LAS90> plot /index LAS90> g\draw text 0 1 'ilambda'"` < lambda < "'ilambda+10'"`" 5 /char 8 LAS90> list LAS90> pause LAS90> endif LAS90> nextwhich enables to view the dumped spectra with a good continuity in intensity.