iles:</p>

<ul>
<li><b>UNIX</b> 

<pre>PGPLOT_DIR="/usr/local/pgplot"; export PGPLOT_DIR <i>(sh)</i>
setenv PGPLOT_DIR /usr/local/pgplot <i>(csh)</i>
</pre>
</li>

<li><b>VMS</b> 

<pre>$ DEFINE PGPLOT_DIR USER:[PGPLOT]
</pre>
</li>
</ul>

<p>The definitions may be placed in a startup file such as <code>.cshrc</code> or <code>login.com</code>. For other ways to locate the files, see the next section.</p>

<h2><a name="ENV">Environment Variables</a></h2>

<p>Some aspects of the behavior of PGPLOT can be modi