Fig. 5
Cov [ τ1,τ2 ] (in s2) for a p1-ridge at a latitude of 40° with an observation time T = 8 h in configuration #1 given by Fig. 4. A travel time τ+ is used for τ1 and τ2. Left: SDO/HMI observations, middle: Monte Carlo simulation, and right: analytic formula.
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