Fig. 5From: A better scoring model for de novo peptide sequencing: the symmetric difference between explained and measured massesExtension of a path \(P=(0,\ldots ,w)\) that represents a prefix by an edge \((w,w')\). The mass of the first character of the label of \((w,w')\) is m. Any mass \(m'\) traversed by \(Q=(0,\ldots ,a,b)\) before the source vertex a of the last edge (a, b) is at least \(2\mu\) smaller than \(w+m\) Back to article page