Load data from file.name and use a spreadsheet-like command: plot " file.name " using 5:($6*2+158) with [lines, dots, points] The annotation will replace the raw commands appeared in the legend plot " file.name " with [lines, dots, points] title "annotation" Use awk , use "< awk '{whatever}' " in the place of filename. Note there is no space after the 1st quotation. make a plot on top of another one (like hold on function in MATLAB) set multiplot on un set multiplot make 3 plots in one figure (like subplot in MATLAB) set multiplot on set size 0.5, 0.5 (default is 1, 1. This makes it 25% smaller) set origin 0,0 (default) plot whatever continue use set size/origin until it is done. output to a file set out put " filename.png " set term inal png (other options include: set term postscript color) replot Good tutorials can be found in the following: T. Kawano -- not s