Integrated H2 emission-line profile across the combined 1.1′′ × 8.8′′ north-south aperture that covers the full broad-component A+B region (as visualized in the middle-left panel of Fig. 1). The 0-velocity is defined as the redshift of the Brγ peak-emission at the location of the secondary nucleus. The ~60 km s-1 redshift of the narrow component is likely due to the fact that the kinematic center of the large-scale molecular disk is ~500 pc north of the secondary nucleus.
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