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Cocaine self-administration by individual rhesus monkeys during extended cocaine access (supplemental sessions of cocaine availability with post-injection time outs of 30, 15 or 7.5 min). Abscissae: Consecutive days of access. Ordinates: Number of cocaine injections (0.1 mg/kg/inj) earned per experimental day. The identification number of each monkey is shown at the top of the panel. Each point shows data from a single determination in one monkey.
