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We present results of a simulation of QCD on a 4x16^3 lattice with 2continuum flavors of p4-improved staggered fermion with mass m/T=0.4.Derivatives of the thermodynamic grand potential with respect to quark chemicalpotential mu_q up to fourth order are calculated, enabling estimates of thepressure, quark number density and associated susceptibilities as functions ofmu_q via Taylor series expansion. Discretisation effects associated withvarious staggered fermion formulations are discussed in some detail. Inaddition it is possible to estimate the radius of convergence of the expansionas a function of temperature. We also discuss the calculation of energy andentropy densities which are defined via mixed derivatives of the thermodynamicgrand potential with respect to the bare couplings and quark masses.Comment: 30 pages, LaTeX2e File, 17 Postscript figure

Equation of state for two flavor QCD at nonzero chemical potential