Bulk statistics. Each panel shows 1D histograms of all values of B_RR² computed with the Parker spiral method (black), mode (red), and mean (blue) at one-hour timescales, integrated over all the data shown in Fig. 1. Reading from left to right, the four individual panels show PSP (for radii less than 0.3AU), PSP (all data), STA and Wind data respectively. Text in the corresponding colour gives the bi-modal peak values and their upper and lower values defining their full width at half maximum (FWHM) in superscript and subscript.