Deepak Kar and Rick Field's measurement of the underlying event in Drell-Yan events. Z−>ee and Z−>μμ events are selected using a Z mass window cut between 70 and 110 GeV. ``Toward'', ``away'' and ``transverse'' regions are defined in the same way as in the original (2001) CDF underlying event analysis. The reconstructed Z defines the ϕ direction of the toward region. The leptons are ignored after the Z has been reconstructed. Thus the region most sensitive to the underlying event is the toward region (the recoil jet is boosted into the away region).