Flexible Stellar Population Synthesis of piXedfit with MCMC fitting for the SEDs of the host galaxies of SN 2018xx (upper panel) and SN 2019gbx (lower panel). The SED plots represent the observed photometric SED (red squares), the median posterior model photometric SED (light gray squares), and the median posterior model spectra (black curve). In the bottom panels are the residuals of the best-fit (dark gray squares). and the zero residual (horizontal black dashed lines).