|The PLplot Plotting Library: Programmer's Reference Manual|
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mode is true)
or leave (when
mode is false)
xor mode for those drivers
(e.g., the xwin driver) that support it. Enables erasing plots by
drawing twice the same line, symbol, etc. If driver is not capable
of xor operation it returns a
status of false.
This function is used in examples 1,20.