[1] CALTECH, JET PROP LAB, CTR INFRARED PROC & ANAL, NASA IPAC EXTRAGALACT DATABASE, PASADENA, CA 91125 USA
[2] AUSTRALIAN NATL UNIV, MT STROMLO & SIDING SPRING OBSERV, WESTON, ACT 2611, AUSTRALIA
[3] JOHNS HOPKINS UNIV, DEPT PHYS & ASTRON, BALTIMORE, MD 21218 USA
[4] UNIV ARIZONA, STEWARD OBSERV, TUCSON, AZ 85721 USA
[5] SPACE TELESCOPE SCI INST, BALTIMORE, MD 21218 USA
[6] DOMINION ASTROPHYS OBSERV, VICTORIA V8X 4M6, BC, CANADA
[7] CARNEGIE INST WASHINGTON, DEPT TERR MAGNETISM, WASHINGTON, DC 20015 USA
[8] UNIV WISCONSIN, DEPT ASTRON, MADISON, WI 53706 USA
[9] HARVARD SMITHSONIAN CTR ASTROPHYS, CAMBRIDGE, MA 02138 USA
[10] ROYAL GREENWICH OBSERV, CAMBRIDGE CB3 0HA, ENGLAND
[11] UNIV CALIF SANTA CRUZ, LICK OBSERV, SANTA CRUZ, CA 95064 USA