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      </control>
      <control date="Fri Sep 22 03:12:36 2017"
               level="3">
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                         time_creation="Wed Sep 20 00:51:15 2017"
                         time_modification="Thu Aug 24 03:54:13 2017" />
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                      epochs_ratio="3.31">
          <mask elevation="03 degrees"
                obs_expected="833"
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                obs_ratio="100.00" />
          <mask elevation="10 degrees"
                obs_expected="833"
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          <mask elevation="15 degrees"
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</QC>
