Figure 2.

PeptideProphet fits on the Human Plasma Dataset. PeptideProphet fits on the Human Plasma Dataset with Tandem Scores on charges 2 (left) and 3 (right). The blue and red curves correspond to the fitted frequency curves of the correct (Normal) and incorrect (Gamma) distributions. The Charge 2 fits yields a mixture distribution with a much stronger separation than the fit to Charge 3.