set terminal postscript enhanced color eps
set output 'converge.eps'
set logscale
set key left top
plot "output.dat" pt 7 ps 2,\
	"out2.dat" pt 5 ps 2,\
    "out3.dat" pt 9 ps 2,\
    "out4.dat" pt 11 ps 2,\
	2e-3*x**2