We have implemented a method to retrieve the extinction coefficient distribution as a function of altitude from LYRA data, and we wish to use the results to analyze the respective contributions of O, O2, O3, and N2 to this extinction. This method has been submitted to some simplifying hypotheses (spectral average of the absorption cross-sections over each LYRA channel, uniformity of the solar emission) and tested on simulated noisy data. The extinction coefficient distribution as a function of altitude could be retrieved. We may then consider to extract the respective contributions of each active atmospheric component, but this would require the addition of external information.

Acknowledgments Funding of M. Dominique and J.-F. Hochedez by the Belgian Federal Science Policy Office (BELSPO) through the ESA/PRODEX programme is hereby appreciatively acknowledged. LYRA is a project of the Centre Spatial de Liege, the PhysikalischMeteorologisches Observatorium Davos, and the Royal Observatory of Belgium. The authors acknowledge the contribution of the whole LYRA consortium and the anonymous referees for their review.

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