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      <bbk:Obs TIME_PERIOD="1972-04" OBS_VALUE="-92.416" BBK_DIFF="-62.2" BBK_DIFF_Y="-138.0"/>
      <bbk:Obs TIME_PERIOD="1972-03" OBS_VALUE="-56.994" BBK_DIFF="-191.7" BBK_DIFF_Y="-506.3"/>
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      <bbk:Obs TIME_PERIOD="1972-01" OBS_VALUE="238.447" BBK_DIFF="279.6" BBK_DIFF_Y="76.7"/>
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      <bbk:Obs TIME_PERIOD="1971-10" OBS_VALUE="-60.647" BBK_DIFF="41.4"/>
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      <bbk:Obs TIME_PERIOD="1971-07" OBS_VALUE="40.659" BBK_DIFF="146.7"/>
      <bbk:Obs TIME_PERIOD="1971-06" OBS_VALUE="-86.985" BBK_DIFF="-166.6"/>
      <bbk:Obs TIME_PERIOD="1971-05" OBS_VALUE="130.686" BBK_DIFF="-46.3"/>
      <bbk:Obs TIME_PERIOD="1971-04" OBS_VALUE="243.469" BBK_DIFF="2689.8"/>
      <bbk:Obs TIME_PERIOD="1971-03" OBS_VALUE="-9.401" BBK_DIFF="79.6"/>
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  </bbk:DataSet>
</CompactData>
