Combined spectrum of stars with nebular features, but no hot star photospheric features: "l," from the first NIFS pointing and "g," "h," "i" from the second; see Figures 1 and 2. The spectral resolution is R(λ/Δλ) = 5160. These spectra were normalized by an A0 V-type standard and multiplied by a black body spectrum corresponding to T _eff = 9000 K. The flux scale was set by assigning the flux at 2.12 μm according to the magnitudes given by Feldt et al. (1998) and a flux zero point at 2.12 μm of 4.75 ×10 ⁻¹¹ erg s ⁻¹ cm ⁻² μm ⁻¹. Typical nebular lines of H and He are shown; other emission lines are described in the text and Figure 6.