Absolute peak magnitudes in the g-band of our subluminous sample (in different colors) and the full ZTF DR2 in the background (in grey) plotted against the SALT2 stretch parameter x1 (left Panel) and the color stretch s_BV (right Panel). These magnitudes are corrected for host galaxy extinction in terms of R_VE(B − V) and from intrinsic color differences in terms of βc, where R_V = 2.31 and β = 3.31. The black lines represent the first-order polynomial best fits to the normal SNe Ia for (0.4 < s_BV < 1.4) and (−5 < x1 < 3). The numbers shown in the legends represent the numbers of good fits obtained from the subluminous and DR2 full sample.