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Fig. A.1.

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Integrated map of H I lines and the outflow tracer lines H2 (17.03 μm) and [Fe II] (24.52 μm) in the G31 region. White contours show ALMA 1.3 mm continuum. The contrasting emission of the outflow tracers demonstrate that, for this region, the H I lines are mainly produced along the outflow (see Table 4).
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