CP2K2026.2 Ar2 native harmonic umbrellas versus bundled PLUMED2.10.1; Ar3 holonomic distance; offline PLUMED2.9.4 precise reweight/4-replica WHAM. Four physical CPUs, one MPI/OMP1 per independent native trajectory. External MD energy column excludes PLUMED bias, native restraint energy includes it. Four PLUMED windows used for WHAM after500fs, not all eight paired controls. 3ps perwindow is a short teaching example, not convergedPMF. StaticREWEIGHT_BIAS cannot replace time-dependent MetaD correction. No binariesbundled.
