Below are x1 and x2 distributions for different eta bins. eta3 is always the larger of the two jet etas. These plots were generated from a pythia sample with 200k events in each of the following 8 pt bins: (7-9, 9-11, 11-15, 15-25, 25-35, 35-45, 45-55, 55+). The vertical lines mark the mean of each distribution.

Below are the eta distributions for the partons in pythia.