set terminal pngcairo size 2048,2048 set key off unset colorbox unset border unset xtics unset ytics unset ztics set parametric set view 90,0 set isosample 100 set pm3d depthorder set pm3d lighting primary 0.50 specular 0.6 set palette defined (0 "#339999", 1 "#339999") splot \