Spectral energy distribution integrated over the nuclear disc containing an FUV bright excess (with an FUV flux non-corrected for Galactic extinction larger than 0.15 MJy sr⁻¹ kpc⁻²). The same data sets and template library as in Fig. 15 are used. In this case, GALEX points are more difficult to reproduce. Aside from the need for a larger 200 Myr stellar population contribution, a fraction of a 12 Gyr large metallicity template is required in addition to the 8 Gyr solar metallicity template.