Fig. 5.
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Comparison between differently extended velocity fields. Left panel: SoFiA-2 moment 1 map of the TNG50 galaxy 520855. Black solid-contours denote receding (50, 100, 150) km s−1 velocities with respect to the systemic velocity. Black dashed-contours instead refer to approaching ( − 150, −100, −50) km s−1 velocities. Centre panel: Velocity field extended with the systemic velocity. Right panel: Velocity field extended with the rotation velocity of the HI disk.
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