As Fig. 2 but for the pseudo 100 × 143 cross-spectra. In purple, we plot the auto-spectrum of 353 GHz residual systematic effects rescaled to 100 × 143 (∼8 × 10⁻⁴ factor applied, ∼0.02 from 100 GHz and ∼0.04 from 143 GHz). The red line is the square root of the product of 100 and 143 GHz noise spectra that is proportional to the variance associated with the noise in the cross-spectrum. In the SRoll2 maps, the large scale is dominated by signal and 1/f noise rather than residual systematic effects.