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      <bbk:Obs TIME_PERIOD="1972-05" OBS_VALUE="-49.032" BBK_DIFF="83.2" BBK_DIFF_Y="-185.1"/>
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      <bbk:Obs TIME_PERIOD="1972-03" OBS_VALUE="-23.146" BBK_DIFF="70.5" BBK_DIFF_Y="-118.4"/>
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      <bbk:Obs TIME_PERIOD="1972-01" OBS_VALUE="-217.572" BBK_DIFF="-145.8" BBK_DIFF_Y="14.1"/>
      <bbk:Obs TIME_PERIOD="1971-12" OBS_VALUE="475.067" BBK_DIFF="455.4"/>
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      <bbk:Obs TIME_PERIOD="1971-10" OBS_VALUE="56.307" BBK_DIFF="349.5"/>
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      <bbk:Obs TIME_PERIOD="1971-08" OBS_VALUE="10.755" BBK_DIFF="-95.7"/>
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      <bbk:Obs TIME_PERIOD="1971-04" OBS_VALUE="147.099" BBK_DIFF="17.0"/>
      <bbk:Obs TIME_PERIOD="1971-03" OBS_VALUE="125.736" BBK_DIFF="-38.4"/>
      <bbk:Obs TIME_PERIOD="1971-02" OBS_VALUE="203.999" BBK_DIFF="180.6"/>
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  </bbk:DataSet>
</CompactData>
