Figure 1

Heat map of metabolites. Each square in the heat map represents the spearman correlation coefficient between two metabolites (each column or row, respectively, represents a distinct metabolite). The strength of correlation is visualized with a color gradient ranging from white (no correlation) over yellow (little correlation) to red (high correlation). (A) 18 amino acids, (B) 46 acylcarnitines (including carnitine), (C) 8 lysophosphatidylcholines, 66 phosphatidylcholines and 16 sphingomyelins.