Molecular Kennicutt–Schmidt relation for kpc-scale measurements across the PHANGS–ALMA sample of galaxies. The straight colour lines represent the best bisector fit to the data for each environment (for reference, the black dotted line represents the fit to all the data). For clarity, the various panels show the same plot with data point density contours for each environment and the corresponding bisector fit (contours encompass 30%, 50%, and 80% of all data points in each category).