Hubble residuals versus the now-corrected Σ_Hα within 1 kpc surrounding each SN Ia. Squares represent Iaα SNe Ia, while circles represent those categorized as Iaϵ. Among the Iaϵ, those with lighter gray belong to M₁, while those with darker gray are in M₂. The two SNe Ia that are overly bright and that have now moved above the SFR threshold (vertical dashed line) are shaded light blue. The original means of the M₁ and M₂ subsamples are shown as horizontal lines, and labeled accordingly. It can be seen that the two modes have moved slightly closer together. The upper panel shows the Σ_Hα histograms for the corrected (solid line) and the original (dashed line) values.