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Internal function. This function shrinks the size of leaves of a dendrogram object. The code was taken from the help files.
.shrinkLeaf(n, spectra)
Returns a node with the label size properties set.
A node in a dendrogram object.
An object of S3 class ChemoSpec::Spectra().
ChemoSpec::Spectra()
Bryan A. Hanson (DePauw University).
https://github.com/bryanhanson/ChemoSpec