GNUPLOT 4.2 - A Brief Manual and Tutorial Department of Civil and Environmental Engineering Edmund T. Pratt School of Engineering Duke University - Box 90287, Durham, NC 27708-0287 1. INSTALLING AND STARTING GNUPLOT - version 4.2 Gnuplot is a free, command-driven, interactive, function and data plotting program. Pre-compiled executeables and source code for Gnuplot 4.2.4 may be downloaded for OS X