# set terminal canvas  rounded size 600,400 enhanced fsize 10 lw 1.6 fontscale 1 name "pm3d_3" jsdir "."
# set output 'pm3d.3.js'
set border 4095 front lt black linewidth 1.000 dashtype solid
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 ylabel "y" 
set yrange [ -15.0000 : 15.0000 ] noreverse nowriteback
set zrange [ -0.250000 : 1.00000 ] noreverse nowriteback
set cblabel "colour gradient" 
set pm3d implicit at b
splot sin(sqrt(x**2+y**2))/sqrt(x**2+y**2)