Blue and red bump features in M4327. The plots show a zoom-in on the spectral region between 4550−4750 Å (left panel), and 5650−5950 Å (right panel), highlighting both stellar and nebular features. Features associated with the so-called blue and red bumps are marked in blue and red, respectively, with nebular line emission in black. The shaded regions highlight the spectral ranges adopted to derive the EW of the associated stellar features (as reported in Table 1), with the “extended red bump” region defined by the combined orange and red area. A single Gaussian fit to the broad He IIλ4686 emission is shown by the dashed line, while the fit to the nebular [Fe III]λ4658 and HeIλ5875 emission lines are marked by solid lines (and shaded in gray).