[1] EUROPEAN SPACE AGCY,DEPT SPACE SCI,DIV ASTROPHYS,F-75738 PARIS 15,FRANCE
[2] CALTECH,JET PROP LAB,PASADENA,CA 91109
[3] NEW MEXICO STATE UNIV,DEPT ASTRON,LAS CRUCES,NM 88003
[4] UNIV MICHIGAN,DEPT ATMOSPHER & OCEAN SIC,ANN ARBOR,MI 48109
[5] UNIV WISCONSIN,DEPT ASTRON,MADISON,WI 53706
[6] JOHNS HOPKINS UNIV,DEPT ASTRON,BALTIMORE,MD 21218
[7] ARIZONA STATE UNIV,DEPT PHYS & ASTRON,TEMPE,AZ 85287
[8] AUSTRALIAN NATL UNIV,MT STROMLO & SIDING SPRING OBSERV,WODEN,ACT 2611,AUSTRALIA
[9] CALTECH,DIV GEOL & PLANETARY SCI,PASADENA,CA 91125