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A revised rotation-vibration line list for the combined hydrogen cyanide(HCN) / hydrogen isocyanide (HNC) system is presented. The line list uses {\itab initio} transition intensities calculated previously (Harris et al., ApJ,2002, 578, 657) and extensive datasets of recently measured experimental energylevels (Mellau, J. Chem. Phys. and J. Mol. Spectrosc. 2010-2011). The resultingline list has significantly more accurate wavelengths than previous ones forthese systems. An improved value for the separation between HCN and HNC isadopted leading to an approximately 25%\ lower predicted thermal population ofHNC as a function of temperature in the key 2000 to 3000 K region.Temperature-dependent partition functions and equilibrium constants arepresented. The line lists are validated by comparison with laboratory spectraand are presented in full as supplementary data to the article and at\url{www.exomol.com}.

ExoMol line lists III: An improved hot rotation-vibration line list for HCN and HNC