equation icon  Y0 = r0p---rSfS- - ---fSrSd---- (150) rS + r0 (rS + r0)2p rSd Y -1 = Y0 + -------, (151) rS + r0 Q- 1- Q0 = 0, (152) s - s = 0, (153) -1 0 T -1- T0 = 2ap. (154)