Bolometric luminosities versus the bolometric temperatures and internal luminosities of a subsample of SUCANES objects. Left: L_bol–T_bol diagram with 59 objects from SUCANES with well-sampled SEDs and L_int< 0.2 L_⊙ (circles). The dotted vertical lines represent the T_bol values used to classify Class 0/I/II objects according to Chen et al. (1995). Right: L_bol versus L_int for the SUCANES objects with L_int ≤ 0.2 L_⊙. The inset histogram represents the distribution of L_bol/L_int ratios for the represented objects. The colours of the circles in the two panels represent the number of data points used to build the SEDs of the objects.