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Fig. 14
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Upper panel: overview of the HL Tau region with ALMA and HST, adapted from ALMA Partnership (2015). The NGS IR WFS was used on XZ Tau located at 22″ for the AO loop, while fringe-tracking and science was done on HL Tau with GRAVITY. Lower panel: squared visibility of HL Tau, centered around the Br-γ line at 2.16 μm.
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