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. Author manuscript; available in PMC: 2021 Dec 3.
Published in final edited form as: IEEE/ACM Trans Comput Biol Bioinform. 2018 Apr 2;16(4):1168–1181. doi: 10.1109/TCBB.2018.2822280

Fig. 1. PSM bipartite graphs.

Fig. 1.

(A) V is the set of all peaks in an observed spectrum. The horizontal lines attached on the left represent the peak intensities in the observed spectrum. U is the set of all fragment ions for a given theoretical spectrum derived from a given peptide. An edge (v, u) connects v ∈ V with u ∈ U if v might possibly be explained by u with an associated non-negative weight. (B) Red lines are selected edges for a particular match. Non-horizontal edges might correspond to neutral losses.