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Fits of the demand curve of Eq. (21) to data on self-administration of four different drugs. a Cocaine in a male rat from Bentzley et al. (2013) (Fig. 3). b Ketamine in male monkeys from Winger et al. (2002) (Fig. 3, upper panel). c Nicotine in humans from Giordano et al. (2001) (Fig. 1). d Remifentanil in male monkeys from Winger et al. (2006) (Table 1)
