nual. The first order YZ-plane chromatic characteristics
of the current lens are calculated and displayed by issuing the
following command:</p>

<p><strong>FCHY ALL</strong></p>

<p>This command displays the primary and secondary axial and lateral
chromatic aberration of the lens based upon the definitions of the
primary and secondary wavelength pairs as set with
the <strong>PCW</strong> and <strong>SCW</strong> command at the lens
input level.</p>

<p>To query the wavelength numbers of <strong>PCW</strong>