       <td>radius of curvature of the bowl [grid points]</td>
    </tr>
    
    <tr valign="top">
        <td width = "150"><code>diameter</code></td>
        <td>aperture diameter of the bowl [grid points]</td>
    </tr>
    
	<tr valign="top">
        <td width = "150"><code>focus_pos</code></td>
        <td>any point on the beam axis of the bowl given as a three element vector [fx, fy, fz] [grid points]</td>
    </tr>    
    
</table>
    
<h2>Optional Inputs</h2>

<p>Optional 'string', value pairs tha