Gravity-sensitive indices used in Sect. 3.1.4 to evaluate the youth of the KMOS sources compared with the SpT. Dots represent the data set from Almendros-Abad et al. (2022) color-coded according to the age class of each object (young in orange, mid-gravity in blue and field in gray). The black solid line represents the decision boundary between young and field objects (see Appendix A). The objects with KMOS spectra are color- and symbol-coded as in Fig. 5. We also show with a black arrow the effect that an extinction of A_V = 5 mag would have on the values of each index.