Upper panel: stellar masses of the galaxies as a function of their r′-band absolute magnitude (M_r′). The black symbols show the transformations when using the relations of Taylor et al. (2011) and the red and blue symbols show the relations when using Bell & de Jong (2001) transformations with the assumed metallicities of 0 and −0.4, respectively. Lower left panel: histogram of the differences between stellar masses obtained using the formulae of Taylor et al. (2011) and Bell & de Jong (2001). Lower right panel: differences in stellar masses when using the models of Bell and de Jong, but assuming two different metallicities.