. . . "The \"Relative Mass Excess\" is the mass excess between the monoisotopic mass of an element and the mass of its A + 1 or its A + 2 isotopic cluster (extrapolated from relative mass defect)." . . "http://www.iso.org/iso/catalogue_detail?csnumber=31895"^^ . "\\(\\Delta_r = \\frac{\\Delta}{m_u}\\), where \\(\\Delta\\) is the mass excess and \\(m_u\\) is the unified atomic mass constant."^^ . "Relative Mass Excess"@en . "http://en.wikipedia.org/wiki/Mass_excess"^^ . "\\(\\Delta_r\\)"^^ .