Picoflare jets at the base of fast wind. (A) Processed HRI_EUV image of the coronal hole (FOV marked in Figs. 1E–F and A.4A). The contours outline photospheric magnetic field patches detected by SO/PHI-HRT (red: positive; blue: negative). An animated version of this panel is shown in Movie S1. Slanted rectangles S1–S7 are slits used to derive the corresponding time-distance maps shown in panels B–H. In these maps (panels B–H), some of the jets are identified by slanted lines, the slopes of which denote the jet speeds as quoted. See Sect. 3 for details.