# set terminal pngcairo  transparent enhanced font "arial,10" fontscale 1.0 size 600, 400 
# set output 'mask_pm3d.3.png'
set dgrid3d 100,100 gauss  5, 5
unset key
set view map scale 1
set style data lines
set xtics border in scale 0,0 mirror norotate  autojustify
set ytics border in scale 0,0 mirror norotate  autojustify
set ztics border in scale 0,0 nomirror norotate  autojustify
set cbtics border in scale 0,0 mirror norotate  autojustify
set rtics border in scale 0,0 nomirror norotate  autojustify
set title "pm3d surface masked by convex hull" 
set xrange [ -30.0000 : 25.0000 ] noreverse
set yrange [ -30.0000 : 25.0000 ] noreverse
set lmargin at screen 0.2
set bmargin at screen 0.1
set rmargin at screen 0.8
set tmargin at screen 0.9
set pm3d interpolate 3,3 flush begin noftriangles noborder corners2color mean
set palette rgbformulae 33, 13, 10
NO_ANIMATION = 1
## Last datafile plotted: "mask_pm3d.dat"
splot  $HULL using 1:2:(0) with mask,        'mask_pm3d.dat' using 1:2:3 mask with pm3d