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Figure 3 - Vapor Concentration Decline <br /> 100000 <br /> as <br /> 10000 <br /> 0 <br /> • <br /> 1000 � � • <br /> 100 <br /> PLO <br /> N <br /> 10 <br /> 1 <br /> 0 5000 10000 15000 <br /> Cumulative Hours of Operation <br />