Distribution of SALT2 stretch (x₁) and color (c) parameters as a function of redshift for the 2667 SNe Ia passing the basic quality cuts detailed in Table 1. The vertical yellow lines illustrate the redshift below which the DR2 sample can be considered volume-limited (z < 0.06) for normal SNe Ia. The corresponding volume-limited parameter distributions are shown in yellow in the marginalized histograms.