Figure 2. Similarity among the FT-ICR-MS samples analyzed in ESI-negative mode during bacterial growth under +P_i and −P_i conditions.

Non metrical multidimensional scaling (NMDS) was performed by employing the Bray-Curtis similarity index and using the data of the unfiltered (A) and filtered (B) datasets. All biological triplicates of +P_i (filled circles) and −P_i (empty circles) conditions are shown. Nearest neighbor samples (i.e. most similar) are connected to visualize pairwise sample similarities. The stress value for both plots is 0.06.