g></p>

<p>The next command will graphically display this fan.</p>

<p><strong>DRAWFAN</strong></p>

<p>The <strong>FANS</strong> command can be used to generate more
complex ray fan aberration graphics. The next two commands generate YZ
and XZ-plane, transverse ray aberration plots at three pre-selected
field of view positions.</p>

<p><strong>FANS </strong>or<strong> FANS YFAN</strong></p>

<p>and</p>

<p><strong>FANS XFAN</strong></p>

<p>There is an extensive list of commands in the CMD section of the
r