set terminal png
set output "fit2.png"
set size 0.8,0.8

set xlabel "x"
set ylabel "y"
set key box
set title "Least Square Fit"

plot "points.dat" with errorbars title "Datapoints", \
     "fit2.dat" title "Fit" with lines

#set terminal x11
#replot
#!echo Press enter to close plot
#pause -1