Overview of coronal holes along the orbit of PSP during perihelion 1. Top panel: two coronal holes sampled by PSP, with contours showing the identified coronal hole with an intensity threshold at 50 DN s⁻¹. The y-axis is aligned with solar north in both images, and the colour scale is clipped at 3000 DN s⁻¹. Bottom panel: Carrington map of the same two coronal holes, with the white line showing the trajectory of PSP ballistically backmappedto 2.5r_⊙. Labelled areas of the trajectory are the in situ data intervals selected for analysis.