As in Fig. 3, but adopting additional mechanisms on the basis of fiducial model 2. In panels A–C three cases with a_RRK = 0, 0.05, and 0.1 are considered, respectively. In panel D a case with faster diffusion rates E_b = 0.3E_d is considered. In panels E–H a scenario with a shock passage is considered, where T = 10 and 20 K represent the temperature when the shocks occurs in the warm-up phase (t_total = 3 × 10⁵ yr and 3.459 × 10⁵ yr, respectively). Peak temperatures T_peak = 200 and 1000 K are the temperatures during shock passage, and t = 10² yr is the duration the passage. In panels I–L a scenario with an X-ray burst is considered, which is described in the models by the elevated cosmic ray ionization rate of ζ_CR = 1.3 × 10⁻¹⁴ s⁻¹ and 1.3 × 10⁻¹³ s⁻¹, T = 10 and 20 K, and the X-ray burst duration is t = 10² yr. After the shock passage and the X-ray burst, all parameters are the same as in fiducial model 2.