Figure 2.

Algae hydrocarbon chromatograms for extracted ion trace m/z 55. Stars are indicating structurally similar components that are eluting in a gradual order. Carbon chain lengths are annotated by NIST MS similarity search. The lower pane represents a heatmap of all peaks (in columns) detected by AMDIS after consistency filtering by SpectConnect (red = present, blue = absent. Substructure annotation and identification of algae components are given in supplement S1 and S2.