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        <observations epoch_first="Tue Aug 25 18:01:14 2009"
                      epoch_last="Tue Aug 25 18:59:59 2009"
                      epochs="1816"
                      epochs_ratio="50.44">
          <mask elevation="03 degrees"
                obs_expected="37143"
                obs_have="17877"
                obs_ratio="48.13" />
          <mask elevation="10 degrees"
                obs_expected="31887"
                obs_have="15725"
                obs_ratio="49.31" />
          <mask elevation="15 degrees"
                obs_expected="27829"
                obs_have="14322"
                obs_ratio="51.46" />
        </observations>
      </control>
    </file>
  </station>
</QC>
