Left: map of the 3-σ sensitivity with the A1-K0-G1-I1 configuration from VLTI. Radial zones are the bins in separation used for the plots in the right panel. Right: sensitivity as a function of angular distance, for various completeness levels. From top to botom: simulations for a single snapshot pointing (top), and for three pointing (middle), and for five pointing (bottom). The contrast axes can be scaled for any accuracy on the closure phase (here σ = 0.25deg).