# set terminal png transparent nocrop enhanced font arial 8 size 420,320 
# set output 'pm3d.15.png'
set border 4095 front linetype -1 linewidth 1.000
set view 50, 220, 1, 1
set samples 30, 30
set isosamples 30, 30
set hidden3d offset 1 trianglepattern 3 undefined 1 altdiagonal bentover
set title "set hidden3d" 
set xrange [ -2.00000 : 2.00000 ] noreverse nowriteback
set yrange [ -2.00000 : 2.00000 ] noreverse nowriteback
set pm3d implicit at s
splot log(x*x*y*y)