Photometry of the main regions, D1, T1, and UT1 (black circles), obtained via aperture photometry (apertures shown in Fig. 2). The best-fit UV beta slopes are shown as blue lines (and relative blue-shaded uncertainties) and reported at the top of the panels. The results of the broadband-SED fitting are over-plotted (red empty squares and red solid line: spectrum of the maximum-likelihood model, with red-shaded uncertainty spectrum) and reported at the bottom of the panels.