PSP measurements during perihelion 1, with vertical dashed lines bounding the three distinct streams discussed in the text. Light grey lines are one-minute measurements and the solid black lines are two-hour averages. Top panel: solar wind velocity, and second panel: cross helicity calculated on a 20-min scale. Third panel: in situ magnetic field, scaled by to make it directly comparable to coronal magnetic field strengths. Horizontal dashed lines show the corresponding magnetic field strength in the source coronal holes. Fourth panel: solar wind mass flux, and fifth panel: parallel electron strahl temperature.