gnuplot / datafile (2E)

gnuplot / datafile (2E) plot several data sets
Gnuplot - Wikipedia, the free encyclopedia

     X     Y     Yerror
   1.0   1.2   0.1
   2.0   1.8   0.1
   3.0   1.6   0.1

   1.1   0.8   0.2
   2.1   0.3   0.2
   3.1   1.0   0.2

   1.2   1.5   0.3
   2.2   2.3   0.3
   3.2   3.1   0.3

set terminal postscript
set output "output.ps"
plot "test.dat" using 1:2 with lines