Stellar population fits of different representative spectra. Top panel: Combined spectrum of the host. Middle panel: integrated spectrum of the core. Bottom panel: GRB site using the X-shooter observations from 14 months after the GRB instead of the SN contaminated MUSE spectra. In each panel, the top left box shows the observed spectrum (black) with the fitted spectrum overplotted in red, the lower left panel the residuals of the fit. The boxes on the right show the light (top) and mass (bottom) fraction for SPs at different ages.