set term png
set title 'Error scaling'
set xlabel 'dt'
set ylabel 'relative error'
set key left top
set logscale x
set logscale y
set style data linespoints
plot 'error-euler.data' title 'Euler', \
	'error-midpoint.data' title 'Midpoint', \
	'error-rk4.data' title '4th order Runge-Kutta'