Two-dimensional histograms of the temperature anisotropy with respect to the parallel plasma β (β_∥) for the SCSW (left), FCSW (middle), and HSS (right). Overplotted are the mirror (solid lines), proton cyclotron (dotted lines), parallel (dashed lines), and oblique (dot-dashed lines) fire hose instabilities assuming a maximum growth rate of 10⁻³ (Hellinger et al. 2006). The dotted white line in the top panels corresponds to the most frequent value in each log₁₀(β); the normalised occurrence in each bin is colour-coded, with red corresponding to 1. The bottom panels correspond to the distribution of the effective total $\overline{\gamma }$ in each log₁₀(α)–log₁₀(β_∥) bin. The near-diagonal dashed white lines in the bottom-right panel highlight the clusters with significantly increased $\overline{\gamma }$.