Fraction of dense gas (F_dense) as a function of the stellar mass surface density (Σ_star) in the SB ring of NGC 1068 at the two averaging scales: 100 pc (left panel) and 400 pc (right panel). Symbols are the same as in Fig. 17. Vertical and horizontal error bars at the lower-right corner of each panel account for the typical uncertainties, which amount to ±0.13 dex and ±0.09 dex, respectively.