adings with the CMD
level <strong>HEADINGS ON</strong> command. See the description in the
reference manual. Then issue the following command:</p>

<p><strong>HEADINGS ON</strong></p>

<p>The paraxial ray trace is automatically performed each time the
lens is updated. It is performed in both the XZ and YZ-planes. It
ignores tilts, decentrations and special surface definitions. To
display YZ-plane paraxial ray data, issue the command:</p>

<p><strong>PXTY ALL</strong></p>

<p>A table displaying the YZ-plane 