#!/usr/bin/env gnuplot set terminal png size 1200,600 enhanced font "Helvetica,20" set output "svs.png" set logscale y plot "svs.txt" using 1:2 title 'R' with lines lw 3, \ "svs.txt" using 1:3 title 'G' with lines lw 3, \ "svs.txt" using 1:4 title 'B' with lines lw 3