# set terminal pngcairo  background "#ffffff" enhanced font "arial,8" fontscale 1.0 size 450, 320 
# set output 'dgrid3d.2.png'
set dgrid3d 30,30, 1
unset key
set view 60, 75, 1, 1
set hidden3d back offset 1 trianglepattern 3 undefined 1 altdiagonal bentover
set title "dgrid3d 30,30 qnorm 1" 
splot "gnu-valley" u 1:2:3 w l