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Fig. 2
Phase velocity of the fast-moving waves produced by a single source at zs = −0.3 Mm (red), zs = −1.3 Mm (yellow), zs = −2.3 Mm (green), zs = −3.3 Mm (light blue), zs = −4.3 Mm (dark blue), and zs = −5.3 Mm (violet). The dashed line shows the fast-wave speed at log τ = −2.
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