Stellar continuum modelling for the galaxy J091703. Stellar continuum fit (red), observed spectrum (black), and error spectrum (yellow); spectral regions masked during the fit are shown in gray. The spectra, shown in F_λ units, have been normalized over 1070–1100 Å. Different ISM absorption lines and stellar features are indicated with black and dark-blue vertical lines in the top part of the figure, respectively. Geo-coronal emissions are labeled at the bottom. The best-fit dust attenuation color-excess (E_B−V, in mag, R16 law), light-weighted stellar age (Myr) and metallicity (Z_⊙) inferred for this source are given in the inset. Uncertainties come from a consistent Monte-Carlo error propagation along the fitting routine.