Example of SWAP observations taken at ∼25.7 au, colored-coded and annotated with the primary source of the counts: solar wind (SW) or interstellar pickup ion (PUI). One-day averages collected on the spacecraft provide highly statistically significant measurements (error bars are too small to be seen, except at the lowest E/q). The average of the hourly solar wind bulk parameters derived over this day (Elliott et al. 2016) are shown in the upper left of the figure. Percentages in brackets on the solar wind parameters indicate the normalized root mean square (rms) variations of the hourly samples.