The function performs a Standard normal variate (SNV) transformation of a spectra. Normalisation is performed subtracting at each peak intensity the mean intensity value of the spectra and then dividing for the standard deviation of the spectra intensities.
A dataframe/matrix with frequency values as first column and at least one column with intensity values.
Return the normalised spectra: the first column represent the frequency data, the second the intensity values normalised by Z-score
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