Figure 2.

Distribution of the mean isotopic distances μ_j of real isotopic clusters as a function of the mono-isotopic peptide mass in the glioma vessels sample H2. The dashed lines represent the acceptance window, between μ_s – σ_s and μ_s + σ_s of mean isotopic distances of real isotopic clusters. The larger mass accuracy with larger peptide masses is reflected by the larger scatter of isotopic distances μ_j