Figure 1
From: Spectral probabilities of top-down tandem mass spectra
A comparison of the conditional spectral probabilities (for PrSMs with one PTM) estimated by the random database-based method and TD-GF. For each of the 101 test PrSMs, the error of the conditional spectral probability reported by TD-GF is computed. For each cut-off of e, the number of PrSMs with an error < e is counted.