B-band luminosity evolution of the S0 remnant labelled gSbgSdo5 for a time period of 7 Gyr, which corresponds to the phase of passive evolution in isolation of the remnants in the scenario we are testing. The evolution of the absolute B magnitude is plotted as a function of the age of the old stellar population. We assume that the old stellar particles are ~11 Gyr old at present, in agreement with data of local S0s (see references in the text), so they have an age of 4 Gyr at z ~ 0.8. Black squares: time evolution of the total B-band magnitude of the S0 galaxy, accounting for the old stellar particles, the young stellar particles, and the residual star formation in the remnant. Green asterisks: contribution to the total luminosity at each epoch of the light coming from the stellar content already existing at z ~ 0.8 (living stars, i.e. old+young stars).