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Figure 2 - Vapor Concentration Decline <br /> 100000 - <br /> a <br /> io <br /> a10000 - <br /> 0 <br /> a� <br /> 1000 <br /> U • <br /> • <br /> 100 - <br /> a <br /> H � <br /> 10 - <br /> a <br /> 1 <br /> 0 2000 4000 6000 8000 10000 12000 <br /> Cumulative Hours of Operation <br />