`gnuplot` can clip data points and lines that are near the boundaries of a graph.
Syntax:
set clip <clip-type>
unset clip <clip-type>
show clip
Three clip types for points and lines are supported by `gnuplot`: `points`, `one`, and `two`. One, two, or all three clip types may be active for a single graph. Note that clipping of color filled quadrangles drawn by pm3d maps and surfaces is not controlled by this command, but by `set pm3d clip1in` and `set pm3d clip4in`.
The `points` clip type forces `gnuplot` to clip (actually, not plot at all) data points that fall within but too close to the boundaries. This is done so that large symbols used for points will not extend outside the boundary lines. Without clipping points near the boundaries, the plot may look bad. Adjusting the x and y ranges may give similar results.
Setting the `one` clip type causes `gnuplot` to draw a line segment which has only one of its two endpoints within the graph. Only the in-range portion of the line is drawn. The alternative is to not draw any portion of the line segment.
Some lines may have both endpoints out of range, but pass through the graph. Setting the `two` clip-type allows the visible portion of these lines to be drawn.
In no case is a line drawn outside the graph.
The defaults are `noclip points`, `clip one`, and `noclip two`.
To check the state of all forms of clipping, use
show clip
For backward compatibility with older versions, the following forms are also permitted:
set clip
unset clip
clip is synonymous with `set clip points`; clip turns off all three types of clipping.