Fig. 5
Expectation value of the cross-covariance function (Panels a), c)) and its noise (Panels b), d)) and for the power spectrum of HMI Doppler observation datacube with a phase speed filter (Fig. 4). Panels a) and b) are cuts at Δ = 24.1 Mm, and Panels c) and d) are cuts at τ = 30.0 min. Normalization factors are determined in the same way as Fig. 3.
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