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. 2021 Apr 10;413(13):3551–3560. doi: 10.1007/s00216-021-03306-7

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© The Author(s) 2021

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Fig. 8 — Score plot of the first and second principal components (PC) (a) with corresponding loading plots (b, c) of the monomer region of the reference spectra of α-pinene, β-pinene, myrcene, and limonene without NO and score plot of the first and second principal components (PC) (d) with corresponding loading plots (e, f) of the monomer region of the reference spectra of α-pinene, β-pinene, myrcene, and limonene with NO