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", 1 "#339999")

splot \
