The experimental correlation function of $\ppiPlus$ pairs (black) as a function of the pair relative momentum $k^*$ in several intervals of the pair \mtText: (a) $[0.54, 0.75)\text{ GeV}/c^2$, (b) $[0.75, 0.95)\text{ GeV}/c^2$, (c) $[0.95, 1.2)\text{ GeV}/c^2$, (d) $[1.2, 1.5)\text{ GeV}/c^2$, (e) $[1.5, 2.0)\text{ GeV}/c^2$, and (f) $[2.0, 2.5)\text{ GeV}/c^2$. The lines (boxes) show the statistical (systematic) uncertainties of the experimental data. The red bands show the fit result according to Eq. (???). The single contributions of correlated background (green), final-state interaction (blue), and $\Delta^{++}(1232)$ (yellow) are presented by the respective colored bands. The width of the bands represents the uncertainty from the fitting procedure. |       |