set nosurface
set contour
set cntrparam levels incremental 0,0.2,2
set term table
set output "multifixed.dat"
set isosamples 200, 200  # the larger the finer the resolution is
splot ( (x**2*y-2)**2+(y**4*x**2-x)**2 )**(1.0/8.0)


set terminal postscript
set output "multifixed.ps"
plot "multifixed.dat" with lines, "multifixed.out" using 2:3 with lines
# plot "multifixed.out" using 2:3 with lines