# set terminal pngcairo  background "#ffffff" enhanced font "arial,10" fontscale 1.0 size 600, 400 
# set output 'singulr.9.png'
set dummy u,v
set parametric
set isosamples 31, 31
set hidden3d back offset 1 trianglepattern 3 undefined 1 altdiagonal bentover
set style data lines
set title "Real part of complex 4th root function" 
set urange [ -1.00000 : 1.00000 ] noreverse nowriteback
set vrange [ -1.00000 : 1.00000 ] noreverse nowriteback
splot u**4-6*u**2*v**2+v**4,4*u**3*v-4*u*v**3,u