e SCY FANG
value was 20.81 degrees. To use <strong>FOB</strong> to specify that
analysis is to be performed at a Y-object angle of 2.5 degrees and an
X-object angle of 1.25 degrees, issue:</p>

<p><strong>FOB 0.1201, 0.060067</strong></p>

<p>since these are the relative fractional object heights
corresponding to the two angles. Now generate a YZ-plane, transverse
aberration fan at the control wavelength with eleven rays in the fan
by entering the following command:</p>

<p><strong>YFAN, -1, 1, 1, 11</stron