Densities, temperatures, and internal particle pressures (nkT) for solar wind ions (black) and H⁺ pickup ions (red). Power law fits to all data (gray and pink points—not time-averaged data) show the radial variation in these parameters for the solar wind ions (orange) and pickup ions (green). Data time-averaged over sidereal periods are over-plotted in red and black. Bars indicate +/− 1 sigma variations in each sidereal period (only plotted if there are at least 10 samples in that period). Note that we only fit to data beyond 22 au where data coverage is large enough that the values are less biased by which portions of the solar wind happen to be sampled.