# set terminal svg size 600,400 dynamic enhanced fname 'arial'  fsize 10 mousing name "pm3dcolors_5" butt solid 
# set output 'pm3dcolors.5.svg'
set format cb "%3.1f"
unset key
set view map
set samples 101, 101
set isosamples 2, 2
set style data pm3d
set style function pm3d
set xtics 2 norangelimit
set noytics
set noztics
set cbtics 0.1 norangelimit
set title "set palette defined ( 20 \"#101010\", 30 \"#ff0000\", 40 \"#00ff00\", 50 \"#e0e0e0\" )" 
set xrange [ -10.0000 : 10.0000 ] noreverse nowriteback
set cbrange [ 0.00000 : 1.00000 ] noreverse nowriteback
set pm3d explicit at b
set palette defined ( 0 0.06275 0.06275 0.06275, 0.3333 1 0 0, 0.6667 0 1 0,\
     1 0.8784 0.8784 0.8784 )
g(x)=x
f(x)=(x+10)/20
GPFUN_g = "g(x)=x"
GPFUN_f = "f(x)=(x+10)/20"
splot f(x)