Fig. 7
Cov [ τ1τ2,τ3τ4 ] (in s4) for a p1-ridge at a latitude of 40° with an observation time T = 8 h in configuration #2 given by Fig. 6. A travel time τ+ is used for the four travel times. Left: SDO/HMI observations, middle: theory, and right: cut through dy = 0 to compare SDO/HMI observations, theory, and Monte Carlo simulations.
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