Fig. 7.
Phase difference (colour) and coherence (greyscale) spectra for Fe I λ 5434 Å line measured with the velocities derived using the COG and line-minima shifts. The grey curve marks the dispersion relation of the surface gravity waves. The blue curves mark the propagation boundary of the acoustic-gravity wave corresponding to the approximate formation heights where the COG (dashed) and line-minima (solid) velocities are measured.
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