Example of a stellar population fit, for the AGN MCG-05-23-016. In the main panel, the X-shooter spectrum is displayed, down-sampled to the BC03 spectral resolution (black), the STARLIGHT fit (blue) with masked areas (in red) and the noise in the data in green. Below the spectrum, the residuals are displayed in terms of the local uncertainty in the data (masked areas are not displayed). In the side panel, the light-weighted star formation history (or stellar population vector) is shown.