MATISSE is the 2nd generation mid-infrared (3.0μm to 12.0μm) spectro-interferometric instrument of the Very Large Telescope Interferometer (VLTI). It was designed to deliver its advertised performance when supported by an external fringe tracker. This proceeding gives an historical account of how the fringe tracker of the GRAVITY instrument, another 2nd generation K-band spectro-astrometric instrument of VLTI, became this external fringe tracker. For a more technical and performance-oriented description of the GRAVITY for MATISSE project, Woillez, Petrov, et al. (2024) should be consulted.
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