HRD of the post-AGB and post-RGB binary candidate samples in the LMC and SMC. The T_eff error bars of ±250 K were omitted for the sake of clarity. Also shown are evolutionary tracks of single star models, taken from the MIST database (Choi et al. 2016), with M_i/M_⊙ = 1.0 and the [Fe/H] of −0.30 and −0.65 corresponding to the mean metallicities of the LMC and SMC, respectively (Westerlund 1997; Larsen et al. 2000). The dashed grey line corresponds to the RGB-tip luminosity of 2500 L_⊙.