Northwestern University:

In 1998, two former Northwestern basketball players were charged and convicted for sports bribery as a result of being paid to shave points in games against three other Big Ten schools during the 1995 season. The football team became embroiled in a different betting scandal later that year when federal prosecutors indicted four former players for perjury related to betting on their own games. In August 2001, Rashidi Wheeler, a senior safety, collapsed and died during practice from an asthma attack. An autopsy revealed that he had ephedrine, a stimulant banned by the NCAA, in his system, which prompted Northwestern to investigate the prevalence of stimulants and other banned substances across all of its athletic programs. In 2006, the Northwestern women's soccer team was suspended and coach Jenny Haigh resigned following the release of images of alleged hazing.

Please answer a question about this article. If the question is unanswerable, say "unanswerable". What did federal prosecutors indict four former players for in a separate betting scandal?
perjury related to betting on their own games