X-CIGALE best-fit SED of GS-14. The fitting prefers a delayed exponential (with an optional exponential burst) SFH, with an old (t_age = 680 ± 170 Myr) stellar population of M_* = (4 ± 1)×10¹⁰ M_⊙ and a young population of 8 ± 6 Myr, which is now experiencing a burst of SF of 90 ± 30 M_⊙ yr⁻¹. The dust and AGN component are not visible in this plot because they contribute most at λ_rest > 3 μm. The investigated parameter space is reported in Table C.1.