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. Author manuscript; available in PMC: 2021 May 1.
Published in final edited form as: Psychopharmacology (Berl). 2020 Jan 31;237(5):1471–1480. doi: 10.1007/s00213-020-05473-4

Fig. 1.

Fig. 1

The mean number of injections/session is shown on the y-axis as a function of the dose of oxycodone (0.012–0.1 mg/kg/injection) on the x-axis. The lower shaded portion represents the mean and standard error (SEM) for saline tests and the upper shaded portion represents the mean and SEM for cocaine (0.1 mg/kg/injection) tests. Data are shown for oxycodone alone (circles) and when combined with 0.006 (upright triangles) and 0.012 (upside down triangles) mg/kg/injection of salvinorin A. Filled symbols represent data points that are significantly different from saline. Error bars represent one SEM and numbers in parenthesis indicate the number of subjects that contributed to a data point when all subjects did not complete a particular dose or dose combination.