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 relative to the direction
of the leading "calorimeter jet", jet1, in the event or relative to the
direction of the leading "charged particle jet" in the event, chgjet1.
The "transverse" region is defined by
60o <|| <120o
and |eta| < 1.
The "transverse" region is perpendicular to the plane of the hard 2-to-2 scattering and is very sensitive to
the "underlying event" component of the QCD Monte-Carlo models.
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