Phase at a frequency of roughly −87.4 nHz corresponding to the peak of power for the Rossby mode ℓ = m = 8, as a function of depth (blue curve). The green line shows the phase of the background at the center of the background interval (see Eq. (3)). The depth refers to the median of the ring-diagram averaging kernels (orange dots), which corresponds to certain target depths (black dots).
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