Hubble residual plots without and with the broken alpha standardisation as a function of host galaxy mass for HV and NV SNe Ia split by d_DLR. The black and red dots represent the NV and HV SNe Ia, respectively. The vertical dashed line represents the criterion (log(M_★/M_⊙) = 10 for the global mass samples). In each plot, the horizontal dashed lines represent the weighted mean of the Hubble residuals, and the shaded regions shows the 1σ uncertainty of the weighted means. The difference of the weighted averages between the low- and high-mass samples along with the significances are shown in the label.