Fractional uncertainty (solid line) of the dust emissivities ϵ_H, normalized to the mean dust SED in Table 1. This total consists of contributions from Galactic residuals (black dashed line), noise (red dashed line with stars), CIB anisotropies (blue dotted line), and the CMB correction (black dash-dotted line). The Galactic residual contribution is dominant at ν> 217 GHz, and the CMB contribution is dominant at lower frequencies.