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Mean (±SEM) cocaine (0.4 mg/kg, IV) infusions over 10 sessions of the maintenance period (2 h daily sessions). The vertical bar with an asterisk indicates a difference between males (n=43) and females (n=45) on total infusions during the 10 sessions of maintenance. Data from some animals on the first 5 sessions of maintenance has been previously published (Swalve et al, 2015) * = p < 0.05.
