 fonts define this value to be 36864.
  </td>
</tr>
<tr>
  <td valign="top">
  <tt>maxWidth</tt>
  </td>
  <td>
  Defined as "maximum character width". <br>
  If not set it is automatically set to the width of the widest character.
  </td>
</tr>
<tr>
  <td valign="top">
  <tt>kernMax</tt>
  </td>
  <td>
  Defined as "negative of maximum kern value". <br>
  The purpose of this field is unknown. <br>
  </td>
</tr>
<tr>
  <td valign="top">
  <tt>nDescent</tt>
  </td>
  <td>
  Defined as "negative of descent". 