<th>2</th><td>x<sub>2</sub></td></tr>
 <tr><th>&hellip;</th><td>&hellip;</td></tr>
 <tr><th>N / 2 - 1</th><td>x<sub>N/2-1</sub></td></tr>
 <tr>
     <th>N / 2</th>
     <td>x<sub>N/2</sub></td>
     <td colspan="5" rowspan="5" align="center" valign="middle">
         &uarr;<br/>
         &larr; D<sub>bottom</sub> &rarr;<br/>
         &darr;
     </td>
 </tr>
 <tr><th>N / 2 + 1</th><td>x<sub>N/2+1</sub></td></tr>
 <tr><th>N / 2 + 2</th><td>x<sub>N/2+2</sub></td></tr>
 <tr><th>&hellip;</th><td>&hellip;</td></