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Fig. 3
Hydrogen recombination line spectra (gray) and Gaussian fits (red) toward BN. The top panel shows the H30α line observed with ALMA. The flux is corrected by primary beam attenuation. The bottom panel shows the H53α line observed with the VLA. The channel widths are 2.0 km s-1 and 10.9 km s-1, respectively.
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