p\mbox{--}$\Sigma^+$ correlation function in high-multiplicity triggered pp collisions at \boldmath{$\sqrt{s}=13$}~TeV. The statistical uncertainties are drawn as bars and the systematic ones as boxes. The data points are shifted to the center of gravity of the mixed-event distribution. The data points show the measurement, containing both the genuine contribution as well as the contributions from feed-down and misidentification. The model calculations are weighted by the genuine $\lambda$ parameter and smeared by the momentum resolution to allow a comparison with data.\\Left: Correlation function with several model calculations using the full wave functions and the effective Gaussian parametrization of the source. The uncertainty bands arise from the uncertainty of the source size.\\Right: Decomposition of the theoretical correlation functions into the singlet (dashed lines) and triplet (dash-dotted lines) contributions. The contributions are multiplied by their statistical weights and added to the Coulomb-only function scaled by 1 – ji, which illustrates the influence of the given contribution on the total correlation function (solid lines).