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        <observations epoch_first="Mon May 31 23:00:00 2010"
                      epoch_last="Mon May 31 23:59:59 2010"
                      epochs="3555"
                      epochs_ratio="98.75">
          <mask elevation="03 degrees"
                obs_expected="37922"
                obs_have="37088"
                obs_ratio="97.80" />
          <mask elevation="10 degrees"
                obs_expected="35991"
                obs_have="35533"
                obs_ratio="98.73" />
          <mask elevation="15 degrees"
                obs_expected="32663"
                obs_have="32255"
                obs_ratio="98.75" />
        </observations>
      </control>
    </file>
  </station>
</QC>
