Reaction-plane deblurring is applied to the triple-differential distributions of protons, deuterons, and negatively charged pions from central Ar $+$ KCl collisions at $1.8\mathrm{GeV}/\mathrm{nucleon}$, measured with the LBL-GSI Streamer Chamber, to yield distributions relative to the true reaction plane of the collisions. Within the reaction plane and in the forward center of mass rapidity region a side ridge away from the beam axis is observed: the distributions peak away from the beam direction for protons and deuterons but not for pions. These findings are consistent with a source of particles moving at an in-plane transverse velocity of $\approx 0.1c$. Transport pawel's BUU calculations yield results in semiquantitative agreement with those from the data.

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• Collective flow
• Low & intermediate energy heavy-ion reactions
• Relativistic heavy-ion collisions
• Transport in heavy-ion collisions