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. 2013 Mar 2;73(3):2306. doi: 10.1140/epjc/s10052-013-2306-0

Fig. 4.

Fig. 4

Variables used in the bisector method. The η-axis corresponds to the azimuthal angular bisector of the dijet system in the plane transverse to the beam, while the ψ-axis is defined as the one orthogonal to the η-axis