Normally a PostScript program can be expected to not mark the page outside its bounding box. If this is not the case, or if you want to specify a bounding box so as to isolate part of a larger figure, there is an option that sets the PostScript clip path so that no marks will show up outside the declared bounding box. Currently this is invoked by adding a clause of the form `` clip=''. Here a slice has been taken out of the pie chart in the example by specifying a smaller bounding box and adding the clip option.
A piece of the pie.
Some PostScript programs use the clipping path to position their output on the page; if a figure is being drawn at its natural size and position despite psfig commands to the contrary, it may need the clip option.