tions assigned to any
surface. It could be used to determine the area of the vignetted
beam. </p>

<p><strong>
    PLOT NEW<br>
    PLOT SCALE 2 2<br>
    ORIENT 2<br>
    PLOT CLAP 2 2<br>
    FOB 1<br>
    FOOT APE 2<br>
    PLOT FOOT</br>
    DRAW<br>
</strong></p>

<p>The <strong>ORIENT 2</strong> command sets the "look" vector to be
normal to surface 2. The <strong>PLOT SCALE 2 2</strong> command just
sets a convenient scale. Remember, look up all these commands in the
reference manual or you won't lea