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Fig. A.1.

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Evolution of the right branch of the filament, observed by the NVST in the Hα line center (panels (a1)–(a5)) and in 304 Å (panels (b1)–(b5)) between 08:06 UT and 08:20 UT. The reconstructed Dopplergrams in panels (c1)–(c5) show bidirectional outflows after the flare. Black and white box indicate the blueshifted intrusion region in the middle of the right branch of the filament.

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