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[ASTRO\]SET FREQUENCY [MainAxis SecondAxis]
Define the main and secondary frequency frames of the current session
for EMIR and NOEMA receiver and backend frequency coverages. The lower
axis of the plots is always in the main frequency frame, while the upper
axis displays the secondary frame. Possible frames are:
REST,LSR,RF for the main frame and
REST,LSR,RF,IF1,IF2,IMREST,IMLSR,IMRF,CHUNK,NULL (i.e. nothing drawn)
for the secondary frame. When CHUNK is chosen, the chunk numbers are
indicated in the upper axis.
SET FREQUENCY DEFAULTS comes back to the default (main='REST', second
axis='NULL'). Note that the main frequency frame defines not only the
lower axis of the plot but also the frame in which input and output fre-
quencies are given.
With no arguments, SET FREQUENCY displays the current content of the ax-