Stellar, gas, and baryonic j − M − f_gas planes, projected into the 2D (j, M) spaces. Galaxies are colour-coded according to their f_gas and are compared with lines of constant f_gas according to Eq. (4) and the best fitting coefficients of Table 1. From red to blue, the lines are at f_gas = 0.01, 0.05, 0.2, 0.4, 0.6, 0.8, 1. For comparison, we show in green the best fitting 2D j − M relations from MP21 and their intrinsic scatter.