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Fig. 3.
Temporal evolution of the Doppler velocity, inferred from the GFPI Fe I 5435 Å restored images, during the appearance of a two-armed spiral wavefront, filtered in frequency bands. From left to right columns: 2–8 mHz, 2–3.5 mHz, 3.5–4.7 mHz, 4.7–8 mHz. The black lines and green circles have the same meaning as in Fig. 2.
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