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Fig.11 Differential charge densities(A—C) and two⁃dimensional differential densities(D—F) of HF⁃NaMnF6(A, D), HF⁃CaMnF6(B, E) and HF⁃AlMnF8(C, F) Note： in the differential charge density， the blue regions indicate increased charge density， while the yellow regions indicate decreased charge density. In the two-dimensional image， charge density increases from blue to red.