PLOT and OVERPLOT commands for plotting data

In general all commands for plotting data , have a well defined syntax:

PLOT/QUALIFIER P1 P2 P3 P4 P5 P6 P7 P8,

where:
P1 = table, image, descriptor or keyword name
P2 = columns, area, or indices of P1
P3 = scales in world coordinates/mm or size of the plot; only for PLOT commands
The meanings of the remaining parameters on the command lines vary from command to command; in most cases they are used for options. Obviously, in case of overplotting , the parameter for the scales is absent.