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               level="3">
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                         size="8781648"
                         time_creation="Tue Jun  4 01:51:40 2019"
                         time_modification="Thu May  9 00:15:02 2019" />
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                      epochs_ratio="100.00">
          <mask elevation="03 degrees"
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          <mask elevation="10 degrees"
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          <mask elevation="15 degrees"
                obs_expected="31440"
                obs_have="29911"
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</QC>
