# set terminal canvas  rounded size 600,400 enhanced fsize 10 lw 1.6 fontscale 1 name "pm3d_11" jsdir "."
# set output 'pm3d.11.js'
set border 4095 front lt black linewidth 1.000 dashtype solid
set view map scale 1
set samples 50, 50
set isosamples 50, 50
unset surface 
set style data pm3d
set style function pm3d
set xyplane relative 0
set title "colour, rgbformulae 30,31,32 ... color printable on gray (black-blue-violet-yellow-white)" 
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 rgbformulae 30, 31, 32
splot sin(sqrt(x**2+y**2))/sqrt(x**2+y**2)