Scatter plot of active region faculae versus quiet-Sun network intensity contrast at a) the continuum and b) the core of the Fe I 6173 Å line, and c) at 1700 Å. The plot points represent the result of binning the intensity contrast measurements by B, ⟨B⟩_loc, and μ, and taking the average within each bin (see Sect. 4.4). The straight lines denote the linear fit to each scatter plot, constrained to pass through the origin. The Pearson correlation coefficient R² and the slope of the linear fit are annotated.