Excess absorption in the helium line core derived from synthetic simulation spectra. EWs were calculated by integrating the flux over the interval λ = [10 832.9, 10 833.62] Å, consistent with the observational methodology described in Section 2. The green region represents the observational results from this study, while the gray points indicate the Keck/NIRSPEC data reported by Kirk et al. (2022) for comparison.