Figure 2From: A nonparametric model for quality control of database search results in shotgun proteomicsInferred filter boundaries for different charge state observations in the control dataset. The pink vertical lines in the +1, +2, and +3 panels are the smallest accepted Xcorr. The red curves are the filter boundaries for FPR = 0.01, and the green curves are the filter boundaries for FPR = 0.05. The blue points on the Xcorr-ΔCn plane represent the randomized database matches, and the red points represent the normal database matches. The shape of the boundaries is greatly different for different charge states.Back to article page