Dependence of the inner edge on stellar mass and metallicity as well as the corresponding dependence between mass and metallicity obtained through the MLR model. The left and middle panels show the power-law indices, which correspond to γ₁ and γ₂ in Eqs. (7) and (8), respectively. Additionally, the right panels show the power-law index corresponding to γ₃ in Eq. (9). The lines represent the fitting results, with color bands indicating 1σ error bars. The colors and styles of points and lines are consistent with those in Fig. 3. Note: The median values and 1σ dispersion of the binned data in this study are calculated in logarithmic space and are based on actual observational data.