Appendices 369 P2 = -2P1 ~ where: Also, -mi exp(-mlt) + rnzexp(-m4 + (mi - m2) exp[-(ml + m,)t] R1 = 1 (C.10) exp(-ml!) - exp(-mz!) ml exp(-mle) - rnzexp(-mzl) R2 - (C. 11) exp(-mle) - exp(-mz!) 1 Appendix D Coefficients A3 and A4.