# set terminal svg size 600,400 dynamic enhanced fname 'arial'  fsize 10 mousing name "hidden_2" butt solid 
# set output 'hidden.2.svg'
set samples 20, 20
set isosamples 20, 20
set hidden3d back offset 1 trianglepattern 3 undefined 1 altdiagonal bentover
set style data lines
set title "Hidden line removal of explicit surfaces" 
set xrange [ -1.00000 : 1.00000 ] noreverse nowriteback
set yrange [ -1.00000 : 1.00000 ] noreverse nowriteback
splot x*y / (x**2 + y**2 + 0.1)