Spectrum of S7-B centered around the three Pa lines. With the blue and red vertical dashed lines, we denote the locations of the blueshifted and redshifted peaks of emission at −355 km s⁻¹ and −265 km s⁻¹, respectively. The nebular counterpart of the Pa lines is indicated with the gray vertical lines at 250 km s⁻¹. The region around ∼908 nm is a saturated [S III] nebular line. Other narrow features are either telluric features or residuals from the nebular subtraction.