[Rivet] revision r961 breaks jet rates in LEP analyses

[Hendrik Hoeth]

Thus spake Hendrik Hoeth (hendrik.hoeth at cern.ch):

> the revision r961 (jmonk, Fix for FastJets not finding particle info)
> breaks the Jade and Durham jet rates in the LEP analyses (in terms of
> "the distributions look like crap").

This is fixed in r972.

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