Left panel: plotted as diamonds is the temperature at +10 d calculated from an extended set of hydrodynamical explosion models that best-fit the bolometric light curves of our sample (see Taddia et al. 2018) vs. the ratio of the ⁵⁶Ni mass and M_ej for each model. The models indicate SE SNe with higher ⁵⁶Ni to M_ej ratios tend to exhibit higher temperatures, and the correlation between these parameters is well described by a power-law fit (black dashed line). Dashed vertical lines indicate the range of the ⁵⁶Ni mass to M_ej ratio inferred by Lyman et al. (2016) based on a large observational sample of SE SNe. The range of the ⁵⁶Ni mass to M_ej ratio for the each SE SN sub-type is relatively narrow, and implies a narrow range of ~1000° in temperature at +10 d. Right panel: inferred B−V color at +10 d determined from hydrodynamical models, plotted versus the ratio between ⁵⁶Ni mass and M_ej. The parameters are fit with a power law function plotted as black dashed line. Dashed vertical lines indicate the range in parameter space inferred by Lyman et al. (2016) for the various SE SN sub-types, while color circles are mean values obtained from the explosion models contained within each of the indicated regions with errorbars corresponding to 1σ uncertainty. This plot indicates a rather narrow range of intrinsic B−V colors are expected for the span of ⁵⁶Ni to M_ej ratios observed in the various SE SN sub-types. B−V color uncertainties are found to be lower than 0.1 mag for each SE SN sub-type.