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A flux-calibrated high resolution spectrum of the airglow emission is apractical lambda-calibration reference for astronomical spectral observations.It is also useful for constraining the molecular parameters of the OH moleculeand the physical conditions in the upper mesosphere. methods: We use the datacollected during the first technical commissioning of the GIANO spectrograph atthe Telescopio Nazionale Galileo (TNG). The high resolution (R~50,000) spectrumsimultaneously covers the 0.95-2.4 micron wavelength range. Relative fluxcalibration is achieved by the simultaneous observation of spectrophotometricstandard star. results: We derive a list of improved positions and intensitiesof OH infrared lines. The list includes Lambda-split doublets many of which arespectrally resolved. Compared to previous works, the new results correct errorsin the wavelengths of the Q-branch transitions. The relative fluxes of OH linesfrom different vibrational bands show remarkable deviations from theoreticalpredictions: the Deltav=3,4 lines are a factor of 2 and 4 brighter thanexpected. We also find evidence of a significant fraction (1-4%) of OHmolecules with ``non-thermal'' population of high-J levels. Finally we listwavelengths and fluxes of 153 lines not attributable to OH. Most of these canbe associated to O2, while 37 lines in the H band are not identified. The O2and unidentified lines in the H band account for ~5% of the total airglow fluxin this band.

A GIANO-TNG high resolution IR spectrum of the airglow emission