set xlabel '1/h'
set ylabel 'eps'

#set term post portrait enhanced font 'Helvetica, 10'
#set output "plot.ps"
#set size 1.0,0.707

set terminal wxt size 750,750 enhanced font 'Verdana,10' persist

#set terminal svg size 750,750 fname 'Verdana' fsize 10
#set output 'plot.svg'

set logscale xy
set size square
set xrange [1E-16:1]
set yrange [1E-16:1]
plot 'error.txt' u 1:2 w points lt 1 pt 1 t 'Error (1st derivative)',\
'error.txt' u 1:4 w points lt 1 pt 2 t 'Error (2nd derivative)'