Abundance Ratios in Composite Stellar Populations with special emphasis n on Elliptical Galax

Our unified chemical and spectrophotometric evolution code allows to nsimultaneously study the ISM abundances of a series of elements and the nspectral properties of the stellar population in our model galaxies. We use nstellar evolutionary tracks, yields, spectra, color and absorption index ncalibrations for 5 different metallicities and account for the increase in ninitial metallici..