Ionised gas pressure (in blue), direct radiation pressure (in orange) and their ratio (in green, values indicated on the right axis) as function of galactocentric radius. Red and dark blue triangles indicate evolved H II regions (hosting a SNR). The black dots indicate the median (±first and third quartile) pressure in radial bins containing an equal number of points (∼120). On top of the figure, we indicate the coefficients of a linear fit to the data.