To select for diffraction dissociation, the following cuts are imposed: 1. The secondary particle with the highest value of the Feynman variable x_F must be a positive (PI+ or K+) particle and x_F must be larger than 0.8. 2. The rapi dity gap between the largest x_F particle and its nearest charged neighbour is required to be the largest in the event and must larger than 2.0 units.
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