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We performed laboratory measurements using the NIST FTS to establish wavelengths for more than 2000 lines in the range 691-5804 nm in the spectrum of a commercial Th-Ar hollow cathode lamp. This line list serves as calibration reference data for the wavelength calibration of ESO's high resolution IR spectrograph CRIRES by means of a physical model of CRIRES which is included in the science data reduction pipeline.

Th-Ar hollow cathode lamps hold the promise of becoming a generally applicable source of standards for wavelength calibration in the near IR, providing a high density of sharp well-characterized emission lines with the ease and efficiency of operation of a commercial discharge lamp.