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        <observations epoch_first="Sun Apr 1 23:00:00 2007"
                      epoch_last="Sun Apr 1 23:59:59 2007"
                      epochs="3568"
                      epochs_ratio="99.11">
          <mask elevation="03 degrees"
                obs_expected="37655"
                obs_have="34358"
                obs_ratio="91.24" />
          <mask elevation="10 degrees"
                obs_expected="30253"
                obs_have="29924"
                obs_ratio="98.91" />
          <mask elevation="15 degrees"
                obs_expected="24547"
                obs_have="24319"
                obs_ratio="99.07" />
        </observations>
      </control>
    </file>
  </station>
</QC>
