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Figure 3 - Vapor Concentration Decline <br /> 100000 - <br /> a <br /> 10000 - <br /> .o <br /> F <br /> CI <br /> 1000 <br /> 0 <br /> U 100 - <br /> a <br /> 10 - <br /> c <br /> 1 <br /> 0 5000 10000 15000 <br /> Cumulative Hours of Operation <br />