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. Author manuscript; available in PMC: 2011 Mar 1.
Published in final edited form as: Pharmacol Biochem Behav. 2009 Dec 21;95(1):51–55. doi: 10.1016/j.pbb.2009.12.005

Fig. 1a.

Fig. 1a

Average number of cumulative cocaine infusions for 8 mg (blue line), 16 mg (pink line) and 32 mg (orange line) depicted over time (i.e., 120 min self-administration period). Cumulative infusion curves appear linear and without evidence of discrete loading/maintenance phases.