Theoretical variation of the maximum visibility deficit max |Δ V| and the maximum closure phase max |Φ| along the trajectory of the face-on (blue) orbit (left) and inclined (red) orbit (right) in the direction shown by the arrows displayed in Fig. 2. The dashed lines indicate the adopted generic detection limits: a visibility deficit of Δ V=0.01 and a closure phase of Φ=1^°. Their colors match those of the corresponding observables. Detection limits are discussed in detail in Sect. 3.2.