file for the output image will still be created.</dd>

  <dt>-a <i>type</i></dt>
  <dd>Select type of averaging to be done on accumulated pixel values (either <b>mean</b> or <b>median</b>).  To generate a map showing counts of how many times each pixel was overlapped by the input images, use <b>count</b>.

  <dt>-e </dt>
  <dd>Enables exact size mode. The output image will match the header template exactly, instead of shrinking the output to fit the data.</dd>

  <dt>-d <i>level</i></dt>
  <dd>Turns on debu