CDF Run I color coherence analysis. Events with ≥3 jets are selected and Et distributions of the three highest-pT jets are obtained. The plotted quantities are the ΔR between the 2nd and 3rd leading jets in the pT and pseudorapidity of the 3rd jet, and α=dη/dϕ, where dη is the pseudorapidity difference between the 2nd and 3rd jets and dϕ is their azimuthal angle difference. Since the data has not been detector-corrected, a bin by bin correction is applied, based on the distributions with ideal and CDF simulation as given in the publication.