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A new interpolation algorithm is derived for obtaining CO 2 15‐μm transmissivities at any pressure from tables of transmission functions at standard pressures. The new method is a revision of the Fels‐Schwarzkopf (1981) technique. Improvements to the standard transmissivity tables are also discussed. An extension of these methods to calculate transmissivities at CO 2 concentrations other than those used for the tables is described.
Schwarzkopf et al. (1985) studied this question.