rsnailfitter is a package aimed at estimating Raupian parameters based on measured snails. All angles must be measured in radians, but distances can be measured in any units as long as they are all the same. Note, that unlike the description in Raup's original paper
Geometric Analysis of Shell Coiling: General Problems (1966). David M. Raup. Journal of Paleontology, vol 40, No 5, pp 1178-1190
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