Fig. 3
Expectation value of the cross-covariance function (Panels a), c)) and its noise, σ(Δ,τ), (Panels b), d)) for the full p-mode power spectrum of HMI Doppler observations (Fig. 2). Panels a) and b) are cuts at Δ = 24.1 Mm, and Panels c) and d) are cuts at τ = 30.0 min. The cross-covariance (cc) function and the noise are both normalized by 
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