Evolution of the morphological fraction of cluster galaxies for z < 0.6. The black circles with error-bars show the measurements of Fasano et al. (2000), complete down to M_V < −20. The thick solid curves show the predictions from our best-fit model using the same photometric completeness, while the thick dashed curves show the predictions using all galaxies available. The thin dashed curves show the assumed field fractions. As discussed in Section 2.2.2, the Ell fraction in the model is set to a constant 27% by construction.