1. Agronomy Dep.; Purdue Univ.; 1150 Lilly Hall West Lafayette IN 47907-1150
2. Dep. of Geophysical Sciences and Consortium for Advanced Radiation Sources; Univ. of Chicago; 5640 South Ellis Ave. Chicago IL 60637
3. Consortium for Advanced Radiation Sources; Univ. of Chicago, Building 901A, Brookhaven National Lab.; Upton NY 11973