Variations in the late-time evolution of the compactness parameter with spatial resolution. The magnitude of these variations is smaller than the variations caused by uncertainties in the wind mass loss. The curves start at oxygen depletion (after the re-meshing described in Appendix B.1.3) and end at the onset of core collapse. They correspond to 25 M_⊙ models computed with a 203-isotope nuclear reaction network, using the V-vL algorithm and η = 0.33 and varying Δ≡mesh˙delta˙coeff, and Δ_{high T}≡mesh˙delta˙coeff˙for˙highT (higher numbers correspond to lower resolution, see text). The highest resolution model (cyan curve) is the model described in Sect. 3.7.