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Indifference points as a function of delay for an individual nonsmoking participant (NS1) and a smoking participant (SM1) for hypothetical money (NS1 & SM1) and hypothetical cigarettes (SM1). These participants were the first smoker and nonsmoker tested in a study by Bickel, Odum, and Madden (1999), who reported median data across groups. See Bickel et al. for details of the procedure. Lines show the best fit of Equation 1 to the data using GraphPad Prism®.
