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Workflow sequence of landmark-based geometric morphometrics performed on phytoliths with biradial symmetry. (A) Digitation of landmarks. (B) Reflection and relabelling of semi-landmarks. Relabelling is required to ensure that original configuration and transformed copies match. (C) GPA performed on the multiplied data set. The consensus (mean) configurations (obtained by averaging of original and transformed configurations) are invariant under all transformation.
