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. 2014 Dec 10;9(12):e113694. doi: 10.1371/journal.pone.0113694

Figure 2. Positive correlation clusters of Δ[11C]carfentanil binding potential (BPND) (placebo - active) versus ΔVAS of feel the effect category in smokers, displayed on trans-axial images of a gray-matter probability maps.

Figure 2

Scatter plots of cluster Δ[11C]carfentanil BPND values to ΔVAS are shown together with regression lines. VAS stands for the visual analog scale of smoking effects, and R2 stands for the coefficient of determination of linear regression.