# set terminal pngcairo  background "#ffffff" enhanced font "arial,10" fontscale 1.0 size 600, 400 
# set output 'scatter.8.png'
set dgrid3d 10,10, 4
set dummy u,v
set parametric
set contour base
set style data lines
set title "Simple demo of scatter data conversion to grid data" 
set xlabel "data style lines, dgrid3d ,,4" 
splot "scatter2.dat"