The real (x axes) and imaginary parts (y axes) of STIX relative visibilities calculated over the period 2024-05-20 05:13:01–05:13:09 and spectral range 32–76 keV. Each panel corresponds to one of the six sub-collimators whose relative visibilities varied most over these ranges. The colours represent the evolution over time (violet to red) at a cadence of 1 s. The title of each panel gives the label, orientation, and angular resolution of the relevant sub-collimator. The error bars represent the 1σ uncertainties. The black dashed lines represent the x = 0 and y = 0 lines. The grey circles centred at the origin help to emphasise the variations in the amplitudes and phases of the relative visibilities.