# set terminal pngcairo  transparent enhanced font "arial,10" fontscale 1.0 size 600, 400 
# set output 'heatmap_points.3.png'
set border 15 front lt black linewidth 1.000 dashtype solid
set dgrid3d 25,25 splines 
unset key
set size ratio 0 0.3,0.3
set origin 0,0.65
set style data lines
set xyplane at -500
unset xtics
unset ytics
unset ztics
unset cbtics
unset rtics
set title "gridded surface fit to points" 
set xrange [ * : * ] noreverse noextend
set yrange [ * : * ] noreverse noextend
set zrange [ -500.000 : 500.000 ] noreverse
set bmargin at screen 0.72
set rmargin  0
set tmargin at screen 0.9
set palette negative nops_allcF maxcolors 0 gamma 1.5 color model RGB 
set palette cubehelix start 0.5 cycles -1.5 saturation 1
NO_ANIMATION = 1
## Last datafile plotted: "mask_pm3d.dat"
## Last plot was a multiplot
# saved multiplot
set multiplot
set label 1 "Heat map of surface fit" font ":Bold"
set label 2 "set dgrid splines"
set label 3 ""
set label 4 "Z value"
set dgrid splines
splot 'mask_pm3d.dat' using 1:2:3 with pm3d,       '' using 1:2:3 with points lc "black" pt 7 ps 0.6 nogrid


set origin 0.0,.65
set margin -1, 0, screen 0.72, screen 0.9

set size 0.3, 0.3
clear
set view
set xyplane at -500
set zrange [-500:500]
unset tics
set border 15
unset for [i=1:4] label i
set title "gridded surface fit to points"
splot 'mask_pm3d.dat' using 1:2:3 with lines lc "cyan", 	  '' using 1:2:3 with points lc "black" pt 7 ps 0.3 nogrid

unset multiplot