Luminosity-weighted ages and metallicities derived from MUFFIT and the BC03 models, for a subsample of ALHAMBRA early-type galaxies at different stellar mass bins and up to z ≤ 0.22. Purple crosses illustrate the semi-axes of the degeneracy ellipses for 1σ confidence level for the BC03 SSP models, as computed in Sect. 4.5, in the same age and metallicites ranges. To guide the eye, yellow crosses illustrate an age of 6 Gyr with solar metallicity.