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The penalty was imposed by U.S. District Judge Jed Rakoff in Manhattan.
Rajaratnam was convicted in May of 14 counts of securities fraud and conspiracy in a separate criminal case. Rakoff's colleague, U.S. District Judge Richard Holwell, sentenced Rajaratnam last month to an 11-year prison term.
(Reporting by Jonathan Stempel in New York, editing by Matthew Lewis)