[O I] 630.0 nm, Hα, Ca II IRT and Pa-13–16, [Fe II] 1643.5 nm, Fe II 1687.7 nm, H₂ 2121.8 nm, Brγ, and the 2–0 and 3–1 CO bandhead regions shown for S4. For clarity, the [Fe II] 1643.5 nm, Fe II 1687.7 nm, H₂ 2121.8 nm, Brγ, and CO bandhead regions have been enhanced by a factor of 5 and 15, respectively. We indicate the positions of the transitions by the red dashed lines. The Pa series and Br-8 line are marked by yellow dash-dotted lines for clarification. The center of Hα was saturated due to nebular emission and has been clipped. All narrow features are either telluric lines or residuals from the nebular or sky subtraction.