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      <bbk:Obs TIME_PERIOD="1972-01" OBS_VALUE="51.34" BBK_DIFF="635.2" BBK_DIFF_Y="-36.1"/>
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      <bbk:Obs TIME_PERIOD="1971-09" OBS_VALUE="2.606" BBK_DIFF="101.6"/>
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      <bbk:Obs TIME_PERIOD="1971-03" OBS_VALUE="-5.147" BBK_DIFF="-115.9"/>
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</CompactData>
