Validation of J-PAS SEDs using MaNGA spectroscopy in the central region of the Alba galaxy (shown in Fig. 1). Top: Gray line indicates the MaNGA spectrum in this area, and the black line shows it after down-sampling with J-PAS filter throughputs. The orange points correspond to the measured J-PAS SED, and the solid orange line illustrates the best-fitting SED model derived from J-PAS data in the same region (after applying a minor constant correction factor of ×1.09 to all filters). Similarly, the teal triangles indicate the measured SDSS SED, and the solid teal line shows the corresponding SDSS SED fit (following the application of a small constant correction factor of ×0.96 to all filters). Some spectral line positions at the Alba galaxy redshift are also shown. Bottom: Percentage difference between the down-sampled MaNGA spectra and the J-PAS photometric data. This validates the very good calibration of J-PAS and allowed us to study regions beyond the small footprint of MaNGA. Furthermore, the orange and teal points and triangles represent the residuals between the SED fits derived from J-PAS and SDSS, respectively, and their corresponding observed fluxes. The dataset used to produce this plot can be accessed at Zenodo (see Appendix E.2).