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Fig. B.2
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Spectral map of the H13CO+ (J=1–0) emission in the inner 658 au centered on the dust continuum emission peak. The whole map is 4″ × 4″ and each pixel corresponds to 0.25″ (~ 41 au). The red spectrum refers to the peak of the continuum emission, and the blue line indicates the systemic velocity (8.3 km s−1).
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