**Figure F****8.** Diagram showing calculation of plane orientation (shaded) from two apparent dips. Intersections of split core surface, section perpendicular to split core surface, and section parallel to core direction with plane of interest are shown. (α_{1}, β_{1}) and (α_{2}, β_{2}) = azimuths and 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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