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. Author manuscript; available in PMC: 2011 Oct 1.
Published in final edited form as: Drug Alcohol Depend. 2011 Mar 16;118(1):23–30. doi: 10.1016/j.drugalcdep.2011.02.012

Fig. 2.

Fig. 2

Mean percentage of negative breath CO samples (CO ≤4 ppm). Each bar represents the mean for all participants (N = 13) during each condition. Circles represent individual participant means during each condition.