Fig. 7
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Brγ emission doublet of X3 observed with SINFONI (left plot, a)) and ERIS (right plot, b)) with a plate scale of 100 mas in 2014 and 2023, respectively. For the two Doppler-shifted Brγ peaks in 2014 and 2023, we determine a separation of 1.5 × 10−3 μm that equals 200 km/s (Peißker et al. 2023b). The peak values of the lines are listed in Table 3.
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