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          <mask elevation="10 degrees"
                obs_expected="35317"
                obs_have="35141"
                obs_ratio="99.50" />
          <mask elevation="15 degrees"
                obs_expected="31881"
                obs_have="31717"
                obs_ratio="99.49" />
        </observations>
      </control>
    </file>
  </station>
</QC>
