# set terminal pngcairo  transparent enhanced font "arial,10" fontscale 1.0 size 600, 400 
# set output 'pm3d.3.png'
set border 4095 front lt black linewidth 1.000 dashtype solid
set style increment default
set samples 25, 25
set isosamples 20, 20
set style data lines
set xyplane relative 0
set title "pm3d at b (bottom)" 
set xlabel "x" 
set xrange [ -15.0000 : 15.0000 ] noreverse nowriteback
set x2range [ * : * ] noreverse writeback
set ylabel "y" 
set yrange [ -15.0000 : 15.0000 ] noreverse nowriteback
set y2range [ * : * ] noreverse writeback
set zrange [ -0.250000 : 1.00000 ] noreverse nowriteback
set cblabel "colour gradient" 
set cbrange [ * : * ] noreverse writeback
set rrange [ * : * ] noreverse writeback
set pm3d implicit at b
splot sin(sqrt(x**2+y**2))/sqrt(x**2+y**2)