Top panel: observed iron distribution of Terzan 5 (gray histogram, from Massari et al. 2014) compared to the prediction of model S02s by Romano et al. (2023, orange shaded region). Bottom panel: [α/Fe]–[Fe/H] abundance pattern observed in Terzan 5 (gray circles, from Origlia et al. 2011, 2013, 2025) compared to the prediction of model S02s presented in Romano et al. (2023, orange shaded region). In both panels, the width of the shaded area represents the uncertainties related to different assumptions about the presence (lower curve) or the absence (upper curve) of hypernovae that, during the explosion, release energies one order of magnitude larger than those of normal core-collapse SNe.