Figure 4.

Snapshot of the GUI to create one of the three matrices. A matrix is created with the number of occurrences of masses in replicate spectra of different samples, a binary table with number of occurrences of masses above a specific threshold, and a matrix with the mean intensity of the present peaks in the mass spectra replicates. A small preview part of an example matrix with a total of 1949 peptide masses and 111 samples, with the number of occurrences of masses in replicate spectra of the samples is presented at the bottom of the GUI.