Fig. 1.
K band spectra for the three GRAVITY observations in 2017. The strongest jet emission lines are Paα and Brβ for the receding and approaching jets, respectively (the former is blended with the Brγ stationary line, the latter with stationary Pfund lines). The brightening and fading of different jet knots are visible over the three observations. Stationary emission lines are labeled in green, but are not the subject of this paper.
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