dth: 30ex"></span>

      <!-- in -->
      <span style="top: 90px"><math><mspace width="2in"/></math></span>
      <span style="top: 80px; width: 192px"></span>

      <!-- mm -->
      <span style="top: 110px"><math><mspace width="50.8mm"/></math></span>
      <span style="top: 100px; width: 192px"></span>

      <!-- pc -->
      <span style="top: 130px"><math><mspace width="12.5pc"/></math></span>
      <span style="top: 120px; width: 200px"></span>

      <!-- pt -->
      <span style="top: 150px"><mat