Comparison of the SpT derived here for the targets (Sect. 3.2) with those reported in the literature (see Table A.1 for the references). Black circles report the most recent SpT estimate found in the literature, while black crosses are used for other SpT estimates available. The dotted lines show the ±2 spectral subclasses difference between the two values. The larger discrepancies are for ISO−Oph123, classified here as K7 except with very uncertain parameters, and ISO−Oph072, which we classify as M3.5, and was reported to be K6.5 in the literature.