Hubble diagram constructed from two different SNe samples: In the case shown in blue, all SNe are correctly matched to their respective host galaxies. In contrast, in the case shown in purple, the host galaxies were matched to each SNe Ia with the algorithm described in Section 2.3. The dashed d_L(z) curve was computed with the parameters fitted from the sample where all SNe Ia are correctly matched to their host galaxies. We see by comparison that the SNe for which the host galaxy has been misidentified are scattered across the upper left region of the plot, shifted horizontally to lower z along a line of constant d_L.