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The pointinterval property of line types is used in plot style linespoints.
A negative value of pointinterval, e.g. -N, means that point symbols are drawn
only for every Nth point, and that a box (actually circle) behind each point
symbol is blanked out by filling with the background color. The command
set pointintervalbox controls the radius of this blanked-out region.
It is a multiplier for the default radius, which is equal to the point size.
2015-04-14