Same as Fig. 3, but computed for one particular metallicity (Z = 0.0017 = 0.1 Z_⊙) and exploring several variations in the input parameters to the model with respect to the reference model presented in the previous sections (and in the top left panel): different overshooting parameterization (Choi et al. 2016), lower efficiency of semiconvective mixing (α_sc = 10 or α_sc = 1), application of MLT++ treatment of convection in radiation-dominated superadiabatic envelope layers (Paxton et al. 2013), and initial rotation velocity Ω = 0.4Ω_crit. In the case of Z = 0.2 Z_⊙, for which observation of evolved supergiants SMC can be used to constrain the models, none of the model variations presented above can be excluded, except for the one with α_sc = 1; see Sect. 4.