NIR spectra of 12 Vul in the J- (upper-left panel), H- (upper-right panel), K- (lower-left panel), and L-bands (lower-right panel). All the spectra were taken with GNIRS, except the one obtained with FIRE, which is pointed to with an F in the observing year. Spectra were normalized and vertically shifted for a better visualization. Positions of the hydrogen lines are marked in the top of each panel, and spectral ranges with telluric remnants are pointed out with the symbol ⊕. The ¹²CO band heads in emission in the K-band are indicated with blue tics.