Transfer function ratio, referred to 100 GHz, for various multipoles. For ℓ = 2–30, the solid red line is the measured 353 GHz empirical SRoll time TF. The red dotted line shows an upper limit on the 353 GHz residuals after correction, while blue and green dotted lines show an estimate of the residuals at 143 and 217 GHz. The TF for ℓ = 30–1000 is estimated from CMB anisotropies on the first three acoustic peaks (with negative values displayed by dashed lines). The grey dashed line is a CMB power spectrum, showing the position of the first three acoustic peaks.
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