EPS Version
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Illustration of correlations in the azimuthal angle relative to the direction of the leading charged jet in the event, chgjet1. The "transverse" region is defined by 60 deg <|| <120 deg 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.