Average escape fraction as a function of metallicity and galactic gas mass (top panels), metallicity and galactic stellar mass (centre), and SFR and stellar mass (bottom). The left and right columns refer to galaxies with log(H/cm)< 20.8 and log(H/cm)> 21.3, which include the ext- and loc-modes, respectively. The contours denote the 1 (solid), 2 (dashed) and 3 (dotted) sigma distribution of galaxy counts.