Estimate of (Eq. (45)), which quantifies the discrepancy between the level of the 70 GHz power spectrum and the level of another map. Top: comparison between the 70 GHz map and the 30 GHz map in the range of multipoles 100 ≤ ℓ ≤ 250. The error bars show the rms of the ratio within each bin of width 15. Bottom: the same comparison done between the 70 GHz map and the 44 GHz map. A 60% mask was applied before computing the spectra.