Galaxy stellar mass functions of the star-forming sample. The points correspond to the V_max estimator (we do not show the other estimators for clarity) and error bars include cosmic variance, Poissonian errors and photo-z/stellar mass uncertainties. The red squares, the blue triangles and the green crosses correspond to the MFs computed using the exponential, delayed and composite libraries. The red solid line is the best-fitted double-Schechter function. The black solid, dashed and dotted lines correspond to the MFs predicted by the semi-analytical model, assuming no error on the stellar masses, an error evolving as described in appendix A (using the product of a Lorentzian and Gaussian distribution), and a Gaussian with a σ = 0.2 dex.