set terminal pngcairo size 2048,2048
set key off
unset colorbox
unset border
unset xtics
unset ytics
unset ztics
set parametric
set view equal xyz
set isosample 100
set pm3d depthorder
set pm3d lighting primary 0.50 specular 0.6
set palette defined (0 "#339999")
splot \