I band spectrum of IRAS 1835−06 (black, solid lines) plotted against IRC +10420 (red, dotted) and HD 223385 (A3 Ia; blue, solid). Spectra have been shifted in wavelength to account for their individual systemic radial velocities as measured from the N iλλ 8703.24, 8711.69, 8718.82 photospheric lines. Prominent emission and photospheric lines are indicated.
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