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      </control>
      <control date="Tue May  1 07:59:00 2012"
               level="3">
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                         size="8106631"
                         time_creation="Sun Apr 29 00:56:25 2012"
                         time_modification="Mon Apr  2 00:08:44 2012" />
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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"
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                obs_have="24581"
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  </station>
</QC>
