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We present an analysis of fluctuations of conserved charges, as baryon number B and electric charge Q, using the Hadron Resonance Gas (HRG) model. The study of such observables within a theoretical approach and the comparison to experimental data on the moments of the multiplicity distributions of specific particles represents a useful tool to extract the chemical freeze-out parameters, temperature T and baryo-chemical potential μ B . In particular we calculate ratios of higher-orderdoi:10.1051/epjconf/20159700019 fatcat:zcjwx35g5bdo5k4agnieg4vzvi