2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/81087NA44 uses a 512 channel Si pad array covering $1.5 <η< 3.3$ to study charged hadron production in Pb+Pb collisions at the CERN SPS. We apply a multiresolution analysis, based on a Discrete Wavelet Transformation, to probe the texture of particle distributions event-by-event, by simultaneous localization of features in space and scale. Scanning a broad range of multiplicities, we look for a possible critical behaviour in the power spectra of local density fluctuations. The data are compared with detailed simulations of detector response, using heavy ion event generators, and with a reference sample created via event mixing.6 pages, 2 figures. Proceedings of the XXXth International Symposium on the Multiparticle Dynamics, Tihany, Hungary, October 2000Nuclear Experimenttext