Frequency-dependent constraints on cosmic birefringence from the LFI and HFI Planck Data Release 4

Open Access

Fig. 4.

Measurement of the power law, β_ν = β₀(ν/ν₀)ⁿ, for various values of f_sky. The upper panel shows the measurement of β₀, while the lower panel models the observed n. We set a flat prior, |n|≤3.

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