1. Klebesadel, R. W., Strong, I. B., and Olson, R. A., Astrophys. J. Lett., 182, L85 (1973).
2. Committee on Extension to the Standard Atmosphere, US Standard Atmosphere (US Government Printing Office, Washington, DC, 1962).
3. Storm, E., and Israel, H. I., Los Alamos Scientific Laboratory Report, LA-3753 (1967).
4. Pages, L., Bertel, E., Joffre, H., and Sklavenitis, L., Atomic Data, 4, 1 (1972).
5. Cline, T. L., Desai, U. D., Strong, I. B., and Klebesadel, R. W., Astrophys. J. Lett., 185, L1 (1973).