equation icon  1 N mnab(x,y) = -F mxnabNA(x - y;m2) + F mxnFxabNB(x - y;m2, Dq), 6 (95) mnab 1- mnab 2 mn ab 2 HA (x,y) = 6F x DA(x - y; m ) + F x F x DB(x - y;m ,Dq).