Scatter plot of closure phases of 20 000 random baseline triangles (black dots) as a function of the maximum linear extension corresponding to the configuration chosen for each instrument of Table 2 and for the RHD simulation of the Sun (Table 1). The coloured symbols over-plotted display the closure phases for the configuration chosen (see the UV-planes of Fig. 4), and the vertical dashed red lines give the approximate positions of the different lobes.