In situ measurements of four different events assigned with four different quality indices, QI4–QI1, from top left to bottom right. Top-to-bottom panels for each event show: (1) magnetic field strength (black, in nT) and its fluctuations (grey, in nT); (2) magnetic field GSE components, x, y, and z, coloured red, blue, and green, respectively (in nT); (3) plasma density (black, in cm⁻³), temperature (red, in 1e5 K), and expected temperature (blue, in 1e5 K); (4) plasma flow speed (black, in km s⁻¹) and beta (grey, non-dimensional); (5) the SOHO/EPHIN F-detector particle count (in %). The shaded region represents the magnetic obstacle, where the borders were selected according to the low-beta condition.