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Figure 2 - Vapor Concentration Decline <br /> 100000 - <br /> a <br /> 10000 - <br /> c <br /> 0 <br /> 1000 • <br /> V s <br /> 100 <br /> Q, <br /> 10 <br /> 1 <br /> 0 2000 4000 6000 8000 10000 12000 <br /> Cumulative Hours of Operation <br />