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. 2021 Sep 9;16(9):e0252806. doi: 10.1371/journal.pone.0252806

Fig 3. FTIR-ATR spectra of reference standards (paraffin-beeswax mixtures containing different proportions of paraffin) used for calibration.

Fig 3

Wavenumber, the number of waves per unit distance; cm, centimetre; a.u. is for the absorbance unit.