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Context. High resolution stellar spectral atlases are valuable resources toastronomy. They are rare in the $1 - 5\,\mu$m region for historical reasons,but once available, high resolution atlases in this part of the spectrum willaid the study of a wide range of astrophysical phenomena. Aims. The aim of theCRIRES-POP project is to produce a high resolution near-infrared spectrallibrary of stars across the H-R diagram. The aim of this paper is to presentthe fully reduced spectrum of the K giant 10 Leo that will form the basis ofthe first atlas within the CRIRES-POP library, to provide a full description ofthe data reduction processes involved, and to provide an update on theCRIRES-POP project. Methods. All CRIRES-POP targets were observed with almost200 different observational settings of CRIRES on the ESO Very Large Telescope,resulting in a basically complete coverage of its spectral range as accessiblefrom the ground. We reduced the spectra of 10 Leo with the CRIRES pipeline,corrected the wavelength solution and removed telluric absorption withMolecfit, then resampled the spectra to a common wavelength scale, shifted themto rest wavelengths, flux normalised, and median combined them into one finaldata product. Results. We present the fully reduced, high resolution,near-infrared spectrum of 10 Leo. This is also the first complete spectrum fromthe CRIRES instrument. The spectrum is available online. Conclusions. The firstCRIRES-POP spectrum has exceeded our quality expectations and will form thecentre of a state-of-the-art stellar atlas. This first CRIRES-POP atlas willsoon be available, and further atlases will follow. All CRIRES-POP dataproducts will be freely and publicly available online.

CRIRES-POP: a library of high resolution spectra from 1 to 5 microns II. Data reduction and the spectrum of the K giant 10 Leo