Measured correlation function of $\Lambda K^+$ pairs. Statistical (bars) and systematic (boxes) uncertainties are shown separately. The light cyan band represents the total fit obtained using Eq.2 from which the normalization $N_D$, and the scattering parameters ($\Re f_0$, $\Im f_0$, and $d_0$) are extracted. The orange band represents the $C_\mathrm{background}(k^{\ast})$ contribution, modeled as described in Section 3, and multiplied by the constant $N_D$. Lower panel: $n_\sigma$ deviation between data and model in terms of numbers of standard deviations.