# set terminal png transparent nocrop enhanced font arial 8 size 420,320 # set output 'pm3d.7.png' set border 4095 front linetype -1 linewidth 1.000 set view map set isosamples 100, 100 unset surface set style data pm3d set style function pm3d set ticslevel 0 set title "gray map, negative" set xlabel "x" set xrange [ -15.0000 : 15.0000 ] noreverse nowriteback set ylabel "y" set yrange [ -15.0000 : 15.0000 ] noreverse nowriteback set zrange [ -0.250000 : 1.00000 ] noreverse nowriteback set pm3d implicit at b set palette positive nops_allcF maxcolors 0 gamma 1.5 gray splot sin(sqrt(x**2+y**2))/sqrt(x**2+y**2)