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7.5 USE WITH EMBEDDED EXPRESSIONS
When used together with Ferret embedded expressions symbols can be used to perform arithmetic on the plot geometry. For example, this command will locate the plot title in bold at the center of a plot regardless of the aspect ratio:
yes? LABEL/NOUSER `($ppl$xlen)/2` `($ppl$ylen)/2` 0 0 .2 @AC($labtit)