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Figure 1

Proton identification with TPC (left) and TOF (right) in \pPb collisions. The discriminating PID variable $n_\sigma$ (see text for details) is shown as a function of the momentum $p$ of the particle. The $n_\sigma$ variable is computed assuming the proton hypothesis. The contributions from electrons and pions in the TPC and from kaons in the TOF are indicated.
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