It's fairly straightforward -- you need to modify the gnuplot commands that gstat emits, either by setting the plotfile command, or by using 'g' from the interactive user interface.
In this file, the following section sets the axes limits. # set axis limits: xmin = 0; xmax = 1.676437e+03 set xrange [xmin:xmax] ymin = 0.000000e+00; ymax = 7.385683e-01 set yrange [ymin:ymax] you can modify this, and the rerun them in gnuplot. Say they're in zz.gnu: $ gnuplot gnuplot> load 'zz.gnu' Best regards, -- Edzer