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. Author manuscript; available in PMC: 2016 Jun 1.
Published in final edited form as: Drug Alcohol Depend. 2015 Apr 5;151:250–257. doi: 10.1016/j.drugalcdep.2015.03.031

Figure 1. Lattice plots of drug use intensity by day and drug type.

Figure 1

Panel A: Any heroin or cocaine use intensity by trial day. B. Any heroin use intensity by trial day. C. Any cocaine use intensity by trial day. Individuals are represented on the y-axis and the intensity of the color indicates the intensity of self-reported drug use for any given day (darker colors represent more reports of drug use).