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Figure 3 - Vapor Concentration Decline <br /> 4000 <br /> 3500 <br /> ,o <br /> 3000 <br /> 2500 <br /> o <br /> 2000 <br /> 1500 • <br /> 1000 <br /> 500 <br /> 0 • <br /> 0 5000 10000 15000 <br /> Cumulative Hours of Operation <br />