# set terminal pngcairo  transparent enhanced font "arial,10" fontscale 1.0 size 600, 400 
# set output 'pm3d.8.png'
set border 4095 front lt black linewidth 1.000 dashtype solid
set view map scale 1
set isosamples 100, 100
unset surface
set style data lines
set xyplane at -0.26
set title "gray map, negative" 
set xlabel "x" 
set xrange [ -15.0000 : 15.0000 ] noreverse
set ylabel "y" 
set yrange [ -15.0000 : 15.0000 ] noreverse
set zrange [ -0.250000 : 1.00000 ] noreverse
set pm3d implicit at s
set palette negative nops_allcF maxcolors 0 gamma 1.5 gray
NO_ANIMATION = 1
splot sin(sqrt(x**2+y**2))/sqrt(x**2+y**2)