Example of a test for intra-cycle visibility (top) and photometry (bottom) variability of S Ori. The red lines denote a pre-minimum phase of 1.39 and the green lines a pre-maximum phase of 1.94. The visibility observations were obtained at similar projected baseline lengths of ~15 m and similar position angles of ~71 °. Both lines were computed as an average of data obtained at the respective phase (±0.15), and for the visibility data at the respective projected baseline length (B_p ± 10%) and position angle (PA ± 10%) (see Table 8).