Example of the spectral fitting process to a green valley galaxy in our sample. Top left: optical image of the galaxy, with its MaNGA plateifu ID indicated. Top right: Best-fit model to the observed data. In this panel, the orange line is the observed spectrum stacked within 1 Re of the galaxy, while the blue line shows the best-fit model spectrum. At the bottom, a green line indicates the residuals, with the grey shaded region showing the emission lines that are masked during the fitting process. Bottom panels: SFH (left), ChEH (middle), and CMDF (right) of this galaxy as calculated from the best-fit parameters. In the middle panel at the bottom, the dashed grey line indicates the observed gas-phase metallicity as obtained from emission line analysis.