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## Figure 1.
Comparison of score histogram versus theoretical distribution. Comparison of score histogram versus theoretical distribution. A randomly picked
query spectrum is used to score peptides in NCBI's nr database. For this query spectrum,
nine hundred unit intensity peaks were added to the processed spectrum to match S_{us}. In panel (A), the red staircase represents the histogram of scores computed using
Eq. (1) with w_{i }= 1, while the blue line represents the theoretical distribution predicted from peptides
with n = 44 theoretical peaks. In panel (B), scores computed using Eq. (1) with w_{i}(m_{i}) = exp(-Δ m_{i}) for peptides with different numbers of theoretical peaks are collected, resulting
in the overall score histogram represented by the red staircase. The solid curve plots
our fitting of the histogram using Eq. (17) where the fitting variables are β, γ ≡ n/(6⟨x^{2}⟩ β^{2}) and .
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