Illustration of the added nebular emission. GALAXEV spectra at z = 2.25 with ages 1, 5, 20, and 100 Myr are shown with nebular emission lines (red) and without (black). The spectra are scaled to arbitrary units to illustrate the effect of age on the nebular emission. The filtercurves of the filters used in the fitting (Bj, Vj, i ⁺ , z ⁺ , J, K_s and Spitzer Ch1-4) are shown at the bottom of the figure. The nebular emission lines are added as delta functions at the respective wavelength of the emission lines, and the step-like appearance of the 1 Myr spectrum is due to the nebular continuum emission. At ages larger than 20 Myr, the effect of the nebular add-on becomes negligible.