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      </control>
      <control date="Thu Dec 10 04:11:00 2020"
               level="3">
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                         size="5169868"
                         time_creation="Mon Dec  7 01:53:19 2020"
                         time_modification="Wed Nov 11 00:08:37 2020" />
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                      epochs_ratio="100.00">
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          <mask elevation="15 degrees"
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                obs_have="22045"
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</QC>
