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Extract from the indicated 3-D SIC variable a Position-Velocity image at the specified Offset (in arcsec) along the specified Axis (X or Y), and display it.
The data cube variable name VarName is optional: the last displayed among SKY, CLEAN and DIRTY data cubes are used in this priority order.
SHOW PV
will simply redisplay (with different controls, see SHOW PV ? to have a list) the last extracted Position-Velocity image.