Production of $\Lambda \overline\Lambda$ pair in 32cm liquid-hydrogen bubble chamber. 16 GeV/c $\pi^{-}$ incident from left; branch in second track from top marks interaction producing two charged particles, a $\Lambda^{0}$ and a $\overline \Lambda^{0}$, these latter shown by characteristic V decays into $p\pi^{-}$ (upper) and $p\pi^{+}$ (lower), repectively

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