Spacecraft potential estimates from LAP and ICA. Coloured circles are the spacecraft potential estimates from LAP, coloured according to data source. Red circles are derived from V_f. Yellow, blue, and green circles are all derived from V_z, but green indicates values that are extrapolated beyond the sweep range and blue indicates sweeps with several zero-crossings (i.e. disturbances). The blue line is a −3.8 V offset-corrected ICA estimate derived from the negative of the lowest energy bin with at least five ion detections and filtered using a 50-point moving average. We note that there are no obvious discontinuities in moving from V_z to V_f.