FERMILAB-COLLIDER. Measurement of the angular distribution of dijets produced in pbar-p collisions at a centre-of-mass energy of 1.8 TeV. Data come from anintegrated luminosity of 94pb-1 collected buring 1993-95. The variable CHI is defined as:. CHI=(1+ABS(COS(THETA*)))/(1-ABS(COS(THETA*))). = EXP(ABS(ETARAP(JET1)-ETARAP(JET2))). where THETA* is the cm scattering angle and ETARAP the jets pseudorapidity.