Invariant-mass distributions of $\Sigma^{+}+\overline{\Sigma}^{-}$ candidates in high-multiplicity (upper panels) and minimum-bias (lower panels) pp collisions at $\sqrt{s}=13$ TeV in 2.0 < $p_{\rm T}$<  2.5 $\rm GeV/\it{c}$ (left panels) and in 5.5 < $p_{\rm T}$<  6.0 $\rm GeV/\it{c}$ (right panels) in same events (black symbols), mixed events (red symbols) and signal (blue symbols). The error bars of the data points correspond to the statistical uncertainties.