clustered components. R12 constrained the combined spectral index of both components between 150 and 220GHz to be $\alpha = 3.56 \pm 0.07$, i.e. the CIB flux scales with frequency as $F_\nu \propto \nu^{\alpha=3.56}$. When the two indices were allowed to vary independently, R12 measured corresponding indices of $\alpha_p = 3.45 \pm 0.11$ and $\alpha_c = 3.72 \pm 0.12$, a difference of 1.7$\sigma$. @dunkley13 also detected significant power attributed to clustered DSFGs in the ACT data and found a preferred combined DSFG spectral index of $3.7 \pm 0.1$, consistent with the R12 results. However, when allowing the spectral indices to vary independently, @dunkley13 were unable to constrain the clustered component of the CIB. The spectral index depends on both the spectral energy distribution of individual DSFGs and their redshift distribution, and these quantities have also recently been determined statistically through cross correlations with ancillary catalogs [@viero13b].

When including a single-component model for correlation between tSZ power and CIB power, R12 found the normalized correlation coefficient at $\ell=3000$ to be $\xi = 0.18 \pm 0.12$. The analysis of the ACT data presented in @dunkley13 does not constrain this correlation; instead, a uniform prior is placed on the correlation.

R12 constrained the amplitude 