Means of power spectrum amplitudes from simulated model maps of cos2ψ within the multipole range 40 ≤ ℓ ≤ 160 for different values of fM and αM and the best-fit power laws (dashed lines). The error bars (1 σ) are standard deviations computed from 100 realisations. Black circles are power spectrum amplitudes from the map of cos 2ψc computed from the CNM template.
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