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A large part of the SCIROCCO Arc Heater Performance Map has been investigated. The heat flux measurements at the stagnation point of the facility Calibratio Probe have been used to find an experimental fit. Such a formula has been compared with the predictions of the De Filippis-Serpico equation and the well known Fay-Riddell formula. Finally the experimental fit has been also compared with the Sagner-Vèrant formula obtained at the ONERA F4 hypersonic plasma wind tunnel. Nomenclature DAS = Data Acquisition System CFD = Computational Fluid Dynamics q n = normalized heat flux q w = wall heat flux q s = stagnation point heat flux P s = stagnation point pressure R s = stagnation point radius H 0 = total enthalpy h w = enthalpy at wall Kn = Knudsen number