# set terminal png transparent nocrop enhanced font arial 8 size 420,320 
# set output 'pm3dcolors.1.png'
set view map
set samples 101, 101
set isosamples 2, 2
set style data pm3d
set style function pm3d
set xtics border mirror norotate 2
set noytics
set noztics
set title "set palette defined" 0.000000,0.000000  font ""
set xrange [ -10.0000 : 10.0000 ] noreverse nowriteback
set yrange [ * : * ] reverse nowriteback  # (currently [-10.0000:10.0000] )
set y2range [ * : * ] reverse nowriteback  # (currently [-10.0000:10.0000] )
set cbrange [ -10.0000 : 10.0000 ] noreverse nowriteback
set pm3d at b
set palette defined ( 0 0.05 0.05 0.2, 0.1 0 0 1, 0.25 0.7 0.85 0.9,\
     0.4 0 0.75 0, 0.5 1 1 0, 0.7 1 0 0, 0.9 0.6 0.6 0.6,\
     1 0.95 0.95 0.95 )
splot x