Mousing operations, in particular zoom and unzoom, will use refresh rather than replot if appropriate. Example:
plot 'datafile' volatile with lines, '-' with labels 100 200 "Special point" e # Various mousing operations go here set title "Zoomed in view" set term post set output 'zoom.ps' refresh
Copyright 1986 - 1993, 1998, 2004 Thomas Williams, Colin Kelley
Distributed under the gnuplot license (rights to distribute modified versions are withheld).