SN Iaα corrected Hubble residual distributions (, blue-filled histogram), and its best Gaussian fit (solid-blue line, one 3σ-outlier rejected). The standardization has been performed on only SNe Iaα. For comparison, the full sample residual distribution (for a full sample standardization) is shown by the open histogram, with its best Gaussian fit in gray. Both distributions where generated from independent standardizations and are therefore centered on zero.