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This operation takes a complex number from the top of the stack and interprets that complex number as X and Y coordinates. It then uses that point as the location where the X and Y axes should intersect for a subsequent plot and stores that information in the plot parameters, found in a variable called PPAR in the current directory. The existing axes which may be specified in an existing PPAR variable will be changed and then PPAR is stored, replacing the old value. If PPAR did not exist prior to executing these operations, a new PPAR variable is created. Its contents will be defaults except for the plot minimum which is specified from the stack.

The default position for the axes is (0,0) but you may want to move the axes to give you some guidance where you are in the plot when you are not plotting near the origin.