OpenMC/tests/regression_tests/source_file/settings.xml

<?xml version="1.0"?>
<settings>
  <state_point batches="10" />
  <source_point separate="true" />
  <eigenvalue>
    <batches>10</batches>
    <inactive>5</inactive>
    <particles>1000</particles>
  </eigenvalue>
  <source>
    <space type="box">
      <parameters>-4 -4 -4  4  4  4</parameters>
    </space>
  </source>
</settings>