Fast-wind region and rarefaction region of the August 2017 stream. From top to bottom: solar wind speed at a time resolution of 6 s (panel a), values computed in a one-hour moving window of the kinetic energy in semi-logarithmic scale (panel b), magnetic energy in semilogarithmic scale (panel c), density compressibility in semilogarithmic scale (panel d), compressibility of the magnetic field magnitude in semilogarithmic scale (panel e), compressibility of magnetic field fluctuations in semilogarithmic scale (panel f), normalized cross-helicity (panel g), and normalized residual energy (panel h). Bottom panel (panel i) shows an enlargement of the total pressure (yellow), magnetic pressure (orange), and thermal pressure (blue) trend in a small region of a few hours close to the velocity knee. The knee is represented by the dashed red line in each panel.