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We show that in order to explain the observed dependence of multiplicity distributions on energy and shifts of the centers of rapidity bins it is sufficient to assume the existence of two sources. One source is concentrated at small rapidities and has properties of a thermally equilibrated system as could be expected from a quark-gluon plasma. The other one, contributing to the whole rapidity region, displays characteristics of bremsstrahlung emission.
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Fowler et al. (1986) studied this question.
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