Fig. 11
OPD residuals as a function of magnitude with an atmospheric OPD of 15 μm rms. The vibration level is 150 nm rms per baseline (low vibration level), and the flux variations are due to 15 mas rms beam tip-tilt variations.The dashed lines correspond to the specification for the fringe tracker of GRAVITY that is to stabilize the fringes below 350 nm rms on a reference star of magnitude K = 10.
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