FIG. 3.ÈDistribution of rest-frame B-band magnitude residuals from the best-Ðt Ñat cosmology for the Ðt C supernova subset, for (a) 18 supernovae, at redshifts z¹ 0.1 and (b) 42 supernovae fromCala n/Tololo the Supernova Cosmology Project, at redshifts between 0.18 and 0.83. The darker shading indicates those residuals with uncertainties less than 0.35 mag, unshaded boxes indicate uncertainties greater than 0.35 mag, and dashed boxes indicate the supernovae that are excluded from Ðt C. The curves show the expected magnitude residual distributions if they are drawn from normal distributions given the measurement uncertainties and 0.17 mag of intrinsic SN Ia dispersion. The low-redshift expected distribution matches a Gaussian with p \ 0.20 mag (with error on the mean of 0.05 mag), while the high-redshift expected distribution matches a Gaussian with p \ 0.22 mag (with error on the mean of 0.04 mag).
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