set terminal png font arial 8 size #600,300
set output 'merge.png'
set grid
set title "Merging times"
set xlabel "value of parameter p"
set ylabel "seconds per sort run"
set xrange [ 1.0000 : 250.0 ] # Aufteilung in p Teile
set yrange [ 0.0000 : 2.0 ] # Sekunden pro sort
set xtics 25,25,500
set ytics 0.25,0.25,3.75
set datafile separator ","
plot 'merge.dat' using 1:2 notitle with points, \
	 'merge.dat' using 1:2 title "interpolate" with lines, \
	 'merge.dat' using 1:2 smooth csplines title "cspline" with lines