**Figure F13.** Diagram of calculation of the orientation of a plane (shaded) from two apparent dips, Expedition 343. Intersections of split core surface and section perpendicular to split core surface and parallel to core direction with plane of interest are shown as an example. (α_{1}, β_{1}) and (α_{2}, β_{2}) = azimuths and apparent dips of traces of the plane on two sections, *v*_{1} and *v*_{2} = unit vectors parallel to traces of the plane on two sections, *v*_{n} = unit vector normal to plane.

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