Data (in black) and best-fitting models (green) for one of the Voronoi-binned data spectra of NGC 3351. Each panel shows the central band pass of the five spectral features used in our analysis: Mgb, Fe 5270, Fe 5335, NaD, TiO₁, and TiO₂. Each green line shows a best-fitting model resulting from sampling the full posterior distribution, taking into account the uncertainty in the recovered SFH. The mean luminosity-weighted age is indicated in the rightmost panel (TiO₂), although the prediction for the index strength is calculated based on the measured SFH (see text for more details).