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Exhaled breath samples acquired with the e-nose device, S1: SP-3, S2: MQ 3, S3: TGS 822, S4: MQ 138, S5: MQ 137, S6: TGS 813, S7: TGS 800, S8: MQ 135; a) COPD exhaled breath measure, b) Smoker breath measure, c) Control (healthy) breath measure.
