Summary of polarization slope trends for the PL-distributed parameter space reported in Table 2, for the HSP objects, selecting MC runs with (10 × 15 Hz ≤ ν_p^S ≤ 10 × 18 Hz). Top panels: Low-energy (a_mm − o, left panels) and high-energy (a_o − X, right panels) polarization slopes as a function of the dispersion in the electron energy distribution index, Δ_p. Middle panels: a_l and a_h as a function of the minimum cell size ratio, r_min. Bottom panels: a_l and a_h as a function of the minimum cutoff ratio, ${\gamma }_{\mathrm{cut}}^{\min .\mathrm{ratio}}$. Different colors and line styles correspond to the various PDFs parameter configurations as indicated in the legend and in the titles of the panels.