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Fig. A.1.

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Top row: Ratio between the non-softened gravitational potential and the Plummer-, Ruffert-, and spline-softened gravitational potentials, as a function of the softening radius and of the distance to the core. Bottom row: Same as the top row but for the gravitational torque density associated with one of the two binary components. The white full lines indicates r r i = ϵ $\left \Vert {\boldsymbol {r}}- \boldsymbol {r}_i \right \Vert = \epsilon$ and the dashed white line r r i = h = 14 ϵ / 5 $\left \Vert {\boldsymbol {r}}- \boldsymbol {r}_i \right \Vert = h = 14\epsilon /5$.

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