Top panels: Mass-weighted composition of the BLh ejecta profile after initialization (left column), at t = 0.1 s (pre neutron freeze-out, central column), and t = 5 × 10⁴ s (right column). Blue, orange, and green lines show results respectively from the backtrack (T_NSE = 8 GK and T_NSE = 6 GK) and the cold-NSE initialization procedures. The black dots represent the Solar r-abundances (Prantzos et al. 2020). The abundances are scaled to match a unitary cumulative abundance for the elements of the first r-process peak, with 72 ≤ A ≤ 94. The vertical dashed lines highlight the position of the elements A = 56. The blue, orange, and purple shaded regions remark the position of the first, second and third r-process peaks, respectively. Bottom panel: relative differences against the BK8 run. The upward [downward] triangles indicate discrepancies greater than two orders of magnitude [smaller than 5 × 10⁻⁴]. The horizontal dashed lines mark the factors 0.01, 1, and 10 discrepancies.