“…First, the aspect ratio of the convecting vessel λ = 4 implies that the global scale lateral heterogeneity of Mercury's crust and mantle [ Ernst et al ., ; Peplowski et al ., ; Charlier et al ., ; Weider et al ., , ; Denevi et al ., ], which is addressed in earlier numerical studies [e.g., Roberts and Barnouin , ; Michel et al ., ], is beyond the scope of this study. Earlier numerical models of the Earth [ Ogawa , ], however, show that the effects of magmatism on mantle dynamics, which is the issue addressed here, do not sensitively depend on λ when λ ≥ 4, and I chose λ = 4 for a computational reason. Second, a shallower mantle and no‐slip boundary condition at the CMB may be more appropriate, if a solid layer of FeS develops at the top of the core [ Smith et al ., ].…”