Due to the extremely large number of transitions required for high-temperature simulations, it was necessary to provide the HITEMP data as separate files to that of HITRAN. The HITEMP line lists retain the same 160-character format that was used for earlier editions of HITRAN.
Given the large quantity of transitions required for high-temperature simulations, it became necessary to separate the HITEMP data into its own files rather than include it with HITRAN. The HITEMP line lists maintain a 160-character format similar to that used in earlier versions of HITRAN.