Orbit-to-orbit hardness profiles categorised into three groups based on F₅₀ thresholds (Eq. (3)): harder (F₅₀ > 0.6, top, blue), softer (F₅₀ < 0.4, middle, red), and standard (0.4 ≥ F₅₀ ≥ 0.6, bottom, green). Left column: Well-defined orbits. Right column: Orbits from the same group with larger variability (see Appendix A for a more elaborated statistical analysis derived from the analysis outlined in Sect. 4.2.2). We refer to the main text for further details.