Basic data file plotting
Script
set xlabel '$\log (T/K)$' set ylabel '$\log(L/L_\odot)$' set nokey set grid x1y1 plot [5.5:3.2][-2:4] 'data.dat' using 4:5 w l
Notes
A simple example of a script to plot data from a file. The using modifier is utilized to select the fourth and fifth columns, and axis labels rendered as equations within LaTeX.