Plot showing contours of constant probability in (d, z) parameter space corresponding to 1 σ for SN 1996ab ﹩( z=0.124) ﹩ and SN 1996C ﹩( z=0.028) ﹩ from the Hubble flow sample, as well as SN 2001iy ﹩( z=0.568) ﹩ and SN 2001jm ﹩( z=0.978) ﹩ from Barris et al. (2004). Also shown are cosmological models for flat universes with ﹩( \Omega _{M},\,\Omega _{\Lambda }) =( 0.3,\, 0.7) ﹩ and (1.0, 0.0), top and bottom, respectively. Distance moduli are calculated with ﹩H_{0}=72﹩ km s⁻¹ Mpc⁻¹. Contours for the two low‐z SNe are artificially truncated since our minimum value for redshift was ﹩z=0.01﹩. With further investigation, such contour plots may allow cosmological density parameters to be determined based purely on photometric observations of high‐z SNe.