Defined by \[G^{\sigma }=H^{\sigma }- T\ S^{\sigma }=A^{\sigma }- \gamma \ A_{\text{s}}\] where \(H^{\sigma }\) is the @S06174@, \(T\) is the @T06321@, \(S^{\sigma }\) is the @S06175@, \(A^{\sigma }\) is the @S06177@, \(\gamma \) is the @S06192@, and \(A_{\text{s}}\) is the area relative to a @G02635@.