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To finish a session in an orderly way, any of the standard commands will suffice, namely END, EXIT or QUIT. If any slots are flagged to be saved (see section 9.6) then the user is returned to the prompt. To finish fast, without checking for whether slots require saving, type KILL.
The use of Ctrl-Y will also exit the program, but it is not recommended. Should the program finish by either a Ctrl-Y interupt, or due to some other `dirty' exit, the images constituting the image stack will remain in the directory LDSS_STACK. If required, and assuming they are uncorrupted, these should be copied or renamed appropriately. The old image stack is deleted when LEXT is run again.