Histogram of the distributions of (in blue) for the same example galaxies as in Fig. 18. The median is shown as a blue vertical dashed line. We show as a bar plot in orange and green the stacked histograms of pixels belonging to our foreground star masks (orange) and to the brightest line-emitting regions (> 99th percentile of the Hα emission, in green). Because the bar plots are stacked, their sum must be smaller than the histogram of all spaxels in blue. This allows us to visually assess that the vast majority of high- pixels are due to foreground stars and bright line-emitting regions.