Figure 1.

Inverse 2nd order derivative FT-IR transmittance spectra of the reference bay laurel leaf essential oil (EO) samples (n = 97); 3300–2700 cm⁻¹ (A); 2100–1500 cm⁻¹ (B); 1500–900 cm⁻¹ (C); 900–500 cm⁻¹ (D). Peaks shifted by more than ± 2 cm⁻¹ are shown in italics.