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Using a reference molecular atlas to ensure self-consistency of wavelengthcalibration is widespread practice. Boesch \& Reiners (Astronomy \&Astrophysics 582 A43 (2015)) reported a line list from a discharge of molecularnitrogen from 4500 to 11000 cm$^{-1}$ for this purpose. With a hollow-cathodedischarge source, we have extended the experimental spectrum up to 15700cm$^{-1}$, to include the range of Ti:sapphire lasers, since the density of N 2lines is greater than atomic atlases in common use. Recognizing thatexperimental conditions can vary, we have also analysed the spectra (comprisingseveral B ${}^3\Pi_g-A\ {}^3\Sigma_u^+$ , B' ${}^3\Sigma_u - B\ {}^3\Pi_g$, andW ${}^3\Delta_u-B\ {}^3\Pi_g N_2$ bands) with standard Hamiltonians, so thatany part of the discharge spectrum 4500-15700 cm$^{-1}$ can be simulated.Parameters are given to do this with the spectral simulation and analysispackage PGOPHER. (C. Western, J. Quant. Spectrosc. Rad. Transf., 186, 221(2016)). The analysis also included high-level ab initio calculations ofpotential energy curves, transition moments and spin-orbit coupling constantsand these were used in preparing the model, extending the potential range ofapplicability. The results are available in a variety of formats to suitpossible applications, including the experimental spectrum in ASCII, a detailedline list with positions and Einstein A coefficients, and a PGOPHER input fileto synthesize the spectrum at selectable temperature and resolution. 2

The spectrum of N$_2$ from 4,500 to 15,700 cm$^{-1}$ revisited with PGOPHER