Spectral type to M_bol (derived from (J−K_S). Colour indicates the value of K_S− [W3], which is related to mass-loss (see text). The LMC data correspond to 2013 and the SMC data correspond to 2012, because all the stars observed in 2010 and 2011 were also observed in 2012 and 2013 and we wanted to avoid to alter the same CSG more than once. The black cross represents the median uncertainties. We note that both figures are in the same scale, to facilitate the comparison. Left a): CSGs from the SMC. Right b): CSGs from the LMC.