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The variants of the rotation method; ghost functions are depicted in magenta. Conformations A and A(ext) are the original structures with an Ar-Bb interaction, B and B(ext) are the reference structures. In the original and the extended version of the rotation method the energy of interaction is calculated as EA-EB and EA(ext)-EB(ext), respectively. EX is the total energy of the appropriate molecular system shown in the figure.
