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International audienceThe azimuthal angle distributions of neutral pions at midrapidity from Au+Au reactions at 1 GeV/nucleon incident energy have been measured. An enhanced emission of π0's perpendicular to the reaction plane is observed. The azimuthal asymmetry is dependent on the π0 momentum: the π0 spectrum perpendicular to the reaction plane is harder than in the reaction plane. The strength of the observed asymmetry appears to be more pronounced for π0 than for charged particles and neutrons