The optimization pathway obtained using the HSE06 functional affords results that are very similar to PBE0-driven optimizations. This is not entirely surprising given that HSE06 is a short-range hybrid functional that is designed to mimic PBE0 while reducing its cost in periodic calculations. The SCAN functional affords energetics that are close to MP2 along various optimization pathways (Fig. ), but that means that DC-SCAN up-shifts the energies relative to MP2, as does the hybrid SCAN0 functional. The DC-SCAN procedure has been recommended in some recent work, but in this particular application the quality of SCAN energetics is somewhat degraded by density correction.