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Figure 3 - Vapor Concentration Decline <br /> 100000 - <br /> a <br /> 10000 - <br /> 49 - - <br /> o <br /> [ 1000 - • <br /> V • <br /> 100 • <br /> 10 - <br /> I--1 <br /> 1 - <br /> 0 5000 10000 15000 <br /> Cumulative Hours of Operation <br /> 9 <br /> T <br />