SALT2 light-curve color (top) and stretch (bottom) as a function of the scaled projected distance to the nearest galaxy cluster (ℛ/ℛ₅₀₀). We highlight SNe Ia found within (outside) clusters in orange (blue). The right part of each panel shows the projected histogram for each subgroup, leftward (rightward) for SNe Ia within (outside) clusters. The mean stretch and color values (and scatter) per bin of ℛ/ℛ₅₀₀ are shown as gray markers (running bands). The error bars associated with these markers are the error on the mean.