Graphing with lout   Most documentation tools can also make
graphs. This article will show you how to use lout, a document
layout language, to create graphs. At the end we will have a
script which creates a history graph of system activity.  First
of all, lout is a document layout program which generates
PostScript. It was written by Jeffrey Kingston at the Basser
Department of Computer Science, the University of Sydney,
Australia. It is available on Red Hat distributions such as
Caldera's, and many Linux ftp sites. Also, the original sources
are available at under the “jeff” directory.  In many ways, lout
is a preprocessor for PostScript, since many lout statements
turn into PostScript instructions. In other ways, lout is a
language for writing structured documents—we describe lists,
sections, chapters, books and reports with lout commands, and
our text becomes the arguments to those commands. In this
article, we will focus on the commands in lout's graph package,
and ignore its other capabilities for docume