Left: effective temperature as a function of mass for massive BDs for three isochrones, calculated with the present models based on the CD21 EOS and ATMO atmosphere models; the Phillips et al. (2020) models based on the CMS19 EOS and ATMO atmosphere models; and the Baraffe et al. (2003) models based on the SCvH EOS and the COND atmosphere models. Right: luminosity as a function of mass for three isochrones for BDs with dynamical mass measurements. References for the data are given in Table 2. All models have an equivalent helium mass fraction of Y_eq = 0.292.