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Fig. 11

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Geometry of a protoplanetary disk for calculations with self-gravity. We calculate the gravitational force exerted by a vertical slice of the disk (blue) on another vertical slice of the disk (red), separated by a distance s. Two vertical integrations have to be performed along the dashed lines that go through the cell centers. To obtain the total force between the two segments, this value has to be multiplied by the corresponding areas, see also Eq. (39).

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