Fig.(7) Comparison of the full NLL BFKL calculation with either a “natural” scale µ=kj,1.kj,2 or a large scale µ=8kj,1.kj,2 and the CMS data, using symmetric cuts defined in Eq. (13). Left: value of <cosφ> as a function of the rapidity separation Y. Right: value of <cos2φ > as a function of the rapidity separation Y.