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GRAVITY is a new generation beam combination instrument for the VLTI. Itsgoal is to achieve microarsecond astrometric accuracy between objects separatedby a few arcsec. This $10^6$ accuracy on astrometric measurements is the mostimportant challenge of the instrument, and careful error budget have beenparamount during the technical design of the instrument. In this poster, wewill focus on baselines induced errors, which is part of a larger error budget.

The interferometric baselines and GRAVITY astrometric error budget