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. Author manuscript; available in PMC: 2010 Aug 1.
Published in final edited form as: Anal Chem. 2009 Aug 1;81(15):6080–6088. doi: 10.1021/ac900424c

Figure 1.

Figure 1

Observed log fold changes are plotted against nominal log fold changes for all metabolites, separately for each dilution. The fold changes are taken with respect to a baseline concentration of 800uM. The solid line represents the expected pattern. The dotted lines denote the 75th quantile of standard deviations of the background metabolites. Colors indicate dilution types.