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        <observations epoch_first="Sat Mar 31 23:00:00 2007"
                      epoch_last="Sat Mar 31 23:59:59 2007"
                      epochs="3579"
                      epochs_ratio="99.42">
          <mask elevation="03 degrees"
                obs_expected="37477"
                obs_have="34769"
                obs_ratio="92.77" />
          <mask elevation="10 degrees"
                obs_expected="31314"
                obs_have="31135"
                obs_ratio="99.43" />
          <mask elevation="15 degrees"
                obs_expected="26193"
                obs_have="26054"
                obs_ratio="99.47" />
        </observations>
      </control>
    </file>
  </station>
</QC>
