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. Author manuscript; available in PMC: 2018 Mar 12.
Published in final edited form as: Pharmacol Biochem Behav. 2015 Apr 28;134:12–21. doi: 10.1016/j.pbb.2015.03.023

Fig. 4.

Fig. 4

Mean number of cocaine and game of chance choices as a function of dose of cocaine smoked at no cost before the choice session in 6 human cocaine smokers. Error bars represent 1 SEM.