To explore the spectral diversity of the data set, a visualization of the FBMN was constructed using Cytoscape . Different layers of information were added according to the chemical taxonomy (color according to the chemical class, superclass, and pathway), and to the proportion of ions in each sample (ratio of MS intensity for each feature detected in the different samples). The raw and filtered annotations, and the Cytoscape files, for PI and NI, can be found in this MassiVE repository link.