Spectral modelling results with STARLIGHT and FADO for a synthetic SED that includes ne for an instantaneously formed stellar population of solar metallicity at an age of 1 Myr. Main panel: black, red, and blue lines show, respectively, the input SED and its fit with STARLIGHT and FADO. Bottom panel: red and blue lines represent the residuals that result from subtraction of the STARLIGHT and FADO fits from the input SED. Top right-hand side panels: light fractions at the normalisation wavelength as a function of age for SSPs selected by STARLIGHT (top) and FADO (bottom) are shown with colour coding representing metallicity. Bottom right-hand side panels: corresponding mass fractions of the SSPs included in the best-fitting PVs with STARLIGHT (top) and FADO (bottom) are shown.