[work] gnuplot

C:\gnuplot\bin\wgnuplot.exe plot_gather.pl

file: plot_gather.pl
==============

set output "stoke_C_gather7.png"
#set terminal postscript eps color 22
set terminal png size 1200, 900

set xlabel "Roughness"
set ylabel "C"
plot [][] \
'curve.txt' using 1:2 with lines title "Roughtness-C"