Figure 5: Ultrahigh resolution mass spectrum of Synechococcus DOM.

(a) Fourier transform ion cyclotron resonance mass spectrum of Synechococcus SPE-DOM, (b) van Krevelen diagram of all assigned molecular formulas of Synechococcus (CB0101) SPE-DOM and (c) van Krevelen diagrams of the distribution of CHNO formulas. Note: size of bubbles represents relative abundance.