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Fig. 3

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Water maser 3D velocities in IRAS 21078+5211. Colored dots and arrows give water maser positions (relative to the reference feature # 0) and proper motions (relative to the YSO), respectively, with colors denoting the maser VLSR. We show only the masers for which the position at the first observing epoch can be derived. The amplitude scale for the velocity is reported in the bottom-left corner of the panel. The black dotted rectangles encompass the three regions to the N, NE, and SW of the YSO, where maser emission concentrates. The sky-projected jet and disk axes are in red and black, respectively, with distances labeled in astronomical units. An elongated maser stream directed approximately S-N is traced with a dashed-line segment labeled “B3.”

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