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Switching between modes can easily be done via ADAM procedures, or by typing in a string of ADAM commands. For example
sets up a command procedure called longslit, which is all you now have to type to go to that mode. Procedures can be stored in a file by issuing the command
ADAM> put myproc
and called back again for use on future nights with the command
ADAM> get myproc
Don't do this during a run though; you will get the message
ADAM ERROR: all procs aborted Dictionary being got from MYPROC.DCT
Do not panic. Nothing has happened. Executing a GET during an exposure is forbidden by the software as it would corrupt the run. Wait until the run is complete and repeat the command.