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OGS
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A local coordinate system used for space-dependent tensor transformations.
It offers a simple way for input of anisotropic tensors w.r.t. a coordinate system.
The basis vectors form a transformation matrix R = (e_0, e_1, e_2).
For a given anisotropic tensor A parameter with the corresponding [tag] use_local_coordinate_system the tensor is rotated according to the formula: A' = R\cdot A\cdot R^T.