Figure 1From: A nonparametric model for quality control of database search results in shotgun proteomicsIdentified nonparametric model for observations in the control dataset with a +2 charge state. (A) The 2-dimensional histogram. (B) The density function curve of the mixed model with 3 Gaussian functions. (C) The error of the density function in each bin. (D) Contour lines of the density function serve as the filter boundaries.Back to article page