Table 2.

Averaged coefficients of variation within the different lipid concentration quartiles obtained on the same day (intra-plate), on different days (inter-day), and in different sites (inter-site) (see Fig. 1 for additional information)

				Variation analysis
Quartile	Range of concentrations (μM)	No. of species	Coverage (mol%)	Intra-plate CV (n = 3)	Inter-day CV	Inter-site CV
First	16–2500	56	93.1	6.6 ± 1.1	10.5	11.6
Second	5–16	56	4.8	9.5 ± 0.91	12.8	14.6
Third	1.5–5	56	1.7	12.3 ± 1.0	15.5	18.7
Fourth	0.05–1.5	56	0.4	16.8 ± 0.2	19.8	22.3