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A recently published experimental dependence of the J/psi to Drell-Yan ratioon the measured, by a zero degree calorimeter, forward energy E_ZDC in Pb+Pbcollisions at the CERN SPS is analyzed. Using a model-independent approach itis shown that the data are at variance with an earlier published experimentaldependence of the same quantity on the transverse energy of neutral hadronsE_T. The discrepancy is related to a moderate centrality region: 100 < N_p <200 (N_p is the number of participant nucleons) and is peculiar only to thedata obtained within the `minimum bias' analysis (using the `theoreticalDrell-Yan'). This could result from systematic experimental errors in theminimum bias sample. A possible source of the errors is discussed.Comment: 10 pages, LaTeX, 3 PS-figures. V2: Misprints are correcte

A model-independent analysis of the dependence of the anomalousJ/ suppression on the number of participant nucleons