 resolution using
the <strong>GRAOUT</strong> command.</p>

<h3>Spot Diagram Generation</h3>

<p>Spot diagrams are easy to generate. Specify the fractional object
position with an <strong>FOB</strong> command and then issue
the <strong>SPD</strong> command. For a graphical display, follow up
with a <strong>PLTSPD</strong> command. Try the following
sequence:</p>

<p><strong>
    FOB, .1 .1<br>
    SPD<br>
    PLTSPD<br>
</strong></p>

<h3>Diffraction MTF</h3>

<p>Diffraction MTF generation and plotting is a