Selection of candidate peptides by decoy score threshold. Upper panels: histograms showing the distribution of the peptide scores (the maximum score was chosen when a peptide was mapped more than once to different open reading frames). Lower panels: scatter-plots comparing those peptide scores with the information content, in bits. Above a bit score of 2.5 (orange line), the peptide sequences can be considered of low complexity or repetitive. Decoy score threshold is depicted on all the panels as a vertical blue line, set at a score of 55 for our data.