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<table>
  <tr>
    <th rowspan="2">Combined operating results<br>Millions of dollars</th>
    <th colspan="3">Year Ended December 31</th>
  </tr>
  <tr>
    <th>2007</th>
    <th>2006</th>
    <th>2005</th>
  </tr>
  <tr>
    <td>Revenue</td>
    <td>$ 500</td>
    <td>$ 435</td>
    <td>$ 487</td>
  </tr>
  <tr>
    <td>Operating income</td>
    <td>$ 111</td>
    <td>$ 108</td>
    <td>$ 100</td>
  </tr>
  <tr>
    <td>Net income</td>
    <td>$ 100</td>
    <td>$ 122</td>
    <td>$ 89</td>
  </tr>
</table>