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Internal function.
.extraData(spectra)
. Logical. TRUE if a mismatch was found for the data lengths. Message are emited as well.
TRUE
An object of S3 class ChemoSpec::Spectra() or ChemoSpec2D::Spectra2D().
ChemoSpec::Spectra()
ChemoSpec2D::Spectra2D()
Bryan A. Hanson (DePauw University).