set terminal postscript eps
set output "error_h_log.eps"

#set format y "10^{%L}"
set logscale y
set xlabel "1/h [Hz]"
set ylabel "error[%]"

plot "error_h_log.dat" using 1:2 title "backword" with points, \
"error_h_log.dat" using 1:2 notitle with lines, \
"error_h_log.dat" using 1:3 title "trapezoidal" with points, \
"error_h_log.dat" using 1:3 notitle with lines