A comparison of the SDSS object redshifts with the redshifts determined using SNID. The vertical error bars show the uncertainty in the SNID redshifts. The horizontal error bars show the uncertainty in the SDSS object redshifts. In most cases these are too small to be visible. All redshifts determined from SN features have an error of at least 0.005. The rms of the distribution is 0.005 (with a negligible bias). SNID redshifts which are calculated using less than five well matched spectra are marked with green triangles.