Self-calibration solution stability for two different sources (corresponding to the sources from Fig. 12). The red line displays the circular standard deviation of the phase solution difference between the current and previous self-calibration cycle for each time and frequency value for each station. The blue line gives the standard deviation of the amplitude ratio of each time and frequency value for each station between the current and previous self-calibration cycle. We note that amplitude solves are only optionally triggered from cycle 3 onward, when the S/N is deemed sufficient by metrics from facetselfcal. The black dashed line corresponds to the selected calibration cycle, based on a combined assessment of the solution and image stability.