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Results are presented of an analysis of proton and charged pion azimuthal distributions measured with respect to the reaction plane in Au ϩ Au collisions at a beam momentum of about 11A GeV/c. The azimuthal anisotropy is studied as a function of particle rapidity and transverse momentum for different centralities of the collisions. The triple differential ͑in rapidity, transverse momentum, and azimuthal angle͒ distributions are reconstructed. A comparison of the results with a previous analysis of charged-particle and transverse energy flow as well as with model predictions are presented. ͓S0556-2813͑97͒05711-7͔ PACS number͑s͒: 25.75.Dw

Event shapes for Au + Au collisions at 11.4 GeV/c per nucleon were studied over nearly the full solid angle with the E877 apparatus. The analysis was performed by Fourier expansion of azimuthal distributions of the transverse energy (E T ) measured 1

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