  Using the large acceptance Time Projection Chamber of experiment E895 at
Brookhaven, measurements of collective sideward flow in Au + Au collisions at
beam energies of 2, 4, 6 and 8A GeV are presented in the form of in-plane
transverse momentum <Px> and the first Fourier coefficient of azimuthal
anisotropy v_1. These measurements indicate a smooth variation of sideward flow
as a function of beam energy. The data are compared with four nuclear transport
models which have an orientation towards this energy range. All four exhibit
some qualitative trends similar to those found in the data, although none shows
a consistent pattern of agreement within experimental uncertainties.
