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      <control date="Fri Feb 18 04:57:19 2011"
               level="3">
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                         size="4585169"
                         time_creation="Wed Feb 16 00:55:50 2011"
                         time_modification="Thu Jan 20 00:19:26 2011" />
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                      epochs_ratio="100.00">
          <mask elevation="03 degrees"
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          <mask elevation="15 degrees"
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                obs_have="29023"
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  </station>
</QC>
