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Fig. 4

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Centre of mass motions. The straight blue lines refer to the MLD-centre of mass (Eq. (46)) whereas the wobbling red curves show the Newtonian centre of mass, Rcom,New=m1q1+m2q2m1+m2${{\bf{R}}_{{\rm{com}},{\rm{New}}}} = {{{m_1}{{\bf{q}}_1} + {m_2}{{\bf{q}}_2}} \over {{m_1} + {m_2}}}$. The x-component of both centers of mass runs horizontally, the y-component increases continuously.

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