</b> for an equivalent model using
    planar arithmetic, or <b>autoTree(2)</b> for a model using spatial
    arithmetic but having slightly different inertias</td>
</tr>
<tr>
  <td><b>planar3</b></td>
  <td>withdrawn.&nbsp; Use <b>planar(3)</b> for an equivalent model using
    planar arithmetic, or <b>autoTree(3)</b> for a model using spatial
    arithmetic but having slightly different inertias</td>
</tr>
<tr>
  <td><b>planarN</b></td>
  <td>withdrawn.&nbsp; Use <b>planar(n)</b> for an equivalent model u