Repeatability and reproducibility of the PFs column on the retention times (t_R, min) of the indicated isomers.

Analytes	Run-to-run (n = 5)		Day-to-day (n = 5)		Column-to-column (n = 3)
	t R (min)	RSD (%)	t R (min)	RSD (%)	t R (min)	RSD (%)
2,5-Dimethylphenol	2.317	0.02	2.317	0.05	2.359	2.48
3,5-Dimethylphenol	2.578	0.03	2.578	0.07	2.616	2.58
2,3-Dimethylphenol	2.735	0.03	2.737	0.07	2.795	3.09
3,4-Dimethylphenol	2.858	0.02	2.856	0.09	2.915	2.26
Citral (cis- or trans-)	2.654	0.03	2.652	0.09	2.652	2.17
Citral (cis- or trans-)	2.867	0.02	2.865	0.09	2.865	2.31
2,6-Dimethylnaphthalene	5.013	0.02	5.014	0.05	5.083	2.60
1,3-Dimethylnaphthalene	5.308	0.02	5.310	0.06	5.411	2.81
2,3-Dimethylnaphthalene	5.708	0.03	5.715	0.08	5.820	2.68
1,2-Dimethylnaphthalene	6.044	0.03	6.050	0.08	6.192	3.68