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      <bbk:Obs TIME_PERIOD="1972-01" OBS_VALUE="-39.797" BBK_DIFF="95.2" BBK_DIFF_Y="29.8"/>
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      <bbk:Obs TIME_PERIOD="1971-10" OBS_VALUE="-66.052" BBK_DIFF="25.6"/>
      <bbk:Obs TIME_PERIOD="1971-09" OBS_VALUE="-88.747" BBK_DIFF="33.2"/>
      <bbk:Obs TIME_PERIOD="1971-08" OBS_VALUE="-132.878" BBK_DIFF="44.0"/>
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      <bbk:Obs TIME_PERIOD="1971-03" OBS_VALUE="151.997" BBK_DIFF="198.4"/>
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  </bbk:DataSet>
</CompactData>
