Spectral line shapes were educed from experimental measurements of CO₂ absorption. The experiments were conducted with a 40-m path and with mixtures of CO₂, N₂, and O₂. The measurements were made in the 2400-cm⁻¹ region of the 4.3-μm band of CO₂, from which the shapes of the high-frequency wing of the CO₂ lines were obtained for self-, N₂-, and O₂-broadening. Two methods were used. One involved expanding the line shape form factor in a series of Chebyshev polynomials. The other was an application of a method proposed by Richardson, based on the Bayes theorem in statistics, from which the form factor was obtained directly. Results from the two methods agreed closely and were tested by simulating a 5.1-km sea-level spectrum recorded at the Naval Research Laboratory, Washington, D.C.

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