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

Figure 3. Correlation clusters of [11C]carfentanil binding potential (BPND) of placebo-cigarette scans versus the Fagerström Test for Nicotine Dependence (FTND) in smokers, displayed on trans-axial images of a gray-matter probability maps.

Figure 3

Right panels show scatter plots using cluster [11C]carfentanil BPND, together with regression line. In regression equations, R2 stands for the coefficient of determination.