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A: Amount (mg/kg; mean ± SEM) of cocaine self-administered by Low Gapers (blue) and High Gapers (red) during the first 10 min of the initial (left) and terminal (right) Phase II trials. B: Amount (mg/kg; mean ± SEM) of cocaine self-administered during the first hour of each Phase II trial. C: The total amount (mg/kg; mean ± SEM) of cocaine self-administered during the 6-hour Phase II trials. *, p < 0.05; #, p <0.01.
