Figure 3.

Score plot of PCA showing metabolic discrimination of developmental stages (EL 32, 34, 35, 36 and 38) corresponding to seasons of 2007 and 2008. Spectral intensities were scaled to total intensity and reduced to integrated regions of equal width (0.04 ppm). The ellipse represents the Hotelling T2 with 95% confidence in score plots. Sugar region (δ 3.08-5.48) was removed from the analysis due to bias created by high concentration of sugar compounds.

Fortes et al. BMC Plant Biology 2011 11:149   doi:10.1186/1471-2229-11-149
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