Acceptance $\times$ efficiency as a function of the transverse momentum of $\Sigma^{+}$ and $\overline{\Sigma}^{-}$ after applying the selection criteria described in the text. The results for $\Sigma^{+}$ (red symbols) and $\overline{\Sigma}^{-}$ (blue symbols) are shown. The error bars of the data points correspond to the statistical uncertainties.