# set terminal pngcairo transparent enhanced font "arial,10" fontscale 1.0 size 500, 350 # set output 'pm3d.41.png' set samples 40, 40 set isosamples 40, 40 set ticslevel 0 set title "pm3d explicit mode --- coloring according to the 4th parameter of 'using'" sinc(u,v) = sin(sqrt(u**2+v**2)) /sqrt(u**2+v**2) GPFUN_sinc = "sinc(u,v) = sin(sqrt(u**2+v**2)) /sqrt(u**2+v**2)" splot 'binary2' binary u 1:2:3:($2+($1+$2)/10) w pm3d, 1+sinc(x*4, y*4) w l