<div class="content"><p>A block of potentially compressed data.</p><table>
 <tbody><tr>
  <th><p><br/>0</p></th>
  <th><p><br/>1</p></th>
  <th><p><br/>2</p></th>
  <th><p><br/>3</p></th>
  <th><p><br/>4</p></th>
  <th><p><br/>5</p></th>
  <th><p><br/>6</p></th>
  <th><p><br/>7</p></th>
  <th><p><br/>8</p></th>
  <th><p><br/>9</p></th>
  <th><p>1<br/>0</p></th>
  <th><p><br/>1</p></th>
  <th><p><br/>2</p></th>
  <th><p><br/>3</p></th>
  <th><p><br/>4</p></th>
  <th><p><br/>5</p></th>
  <th><p><br/>6</p></th>
  <th><p><br/>7</p></th>
  <th><p><br/>8</p></th>
  <th><p><br/>9</p></th>
  <th><p>2<br/>0</p></th>
  <th><p><br/>1</p></th>
  <th><p><br/>2</p></th>
  <th><p><br/>3</p></th>
  <th><p><br/>4</p></th>
  <th><p><br/>5</p></th>
  <th><p><br/>6</p></th>
  <th><p><br/>7</p></th>
  <th><p><br/>8</p></th>
  <th><p><br/>9</p></th>
  <th><p>3<br/>0</p></th>
  <th><p><br/>1</p></th>
 </tr>
 <tr>
  <td colspan="32">
  <p align="center">Block
  Header</p>
  </td>
 </tr>
 <tr>
  <td colspan="32">
  <p align="center">...</p>
  </td>
 </tr>
 <tr>
  <td colspan="32">
  <p align="center">...</p>
  </td>
 </tr>
 <tr>
  <td colspan="32">
  <p align="center">Block
  Data (variable)</p>
  </td>
 </tr>
 <tr>
  <td colspan="32">
  <p align="center">...</p>
  </td>
 </tr>
</tbody></table><p><b>Block Header (12 bytes): </b>An XPRESS Block
Header (as specified in section <a href="417b2137-23f9-4bce-949b-23eee7877235" data-linktype="relative-path">2.2.1.4.15.1</a>) containing
information about the block data.</p><p><b>Block Data (variable): </b>If the values of the <b>Block
Compressed Size</b> and <b>Block Uncompressed Size</b> fields in the XPRESS
block&#39;s header (specified in section 2.2.1.4.15.1) are equal, then the block
data has not been compressed. In this case the uncompressed data is obtained by
copying bytes from the <b>Block Data</b> field without modification.</p><dl>
<dd>
<p>If the value of the <b>Block Compressed Size</b>
field is less than the value of the <b>Block Uncompressed Size</b> field, then
the data has been compressed. For more information about decompressing
compressed data, see section <a href="8cb5bae9-edf3-4833-9f0a-9d7e24218d3d" data-linktype="relative-path">3.1.1.2</a>.</p>
</dd></dl></div>