 name <code>rgb.txt</code> in the directory specified by PGPLOT_DIR. The color-name database is only used by programs that call <a href="subroutines.html#PGSCRN">PGSCRN</a>, or when environment variable PGPLOT_BACKGROUND or PGPLOT_FOREGROUND is defined. e.g. 

<pre>setenv PGPLOT_RGB /usr/local/pgplot/rgb.txt
</pre>
</dd>

<dt>PGPLOT_DEV</dt>

<dd><i>Device specification.</i> If this variable is defined, it is used as the default device specification: if the device specification given to <a href="subroutines