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I am looking for a high resolution (at least 0.5 nm) spectrum showing atmospheric absorption (particularly for oxygen and water) in the wavelength region of 600-800 nm. I want to find windows of very low absorption in Earth's atmosphere. I've looked at several related stack exchange questions, here, and here, but I have not yet find a good resource for this.

I found the HITRAN database and some models that use the line intensities and other parameters from HITRAN. The problem is that I haven’t found one that simulates bottom of atmosphere absorption.

This SPECTRA model is almost what I want, but one of the inputs to the simulation is optical path length, and what I want is the absorption from a path through the whole atmosphere (and since temperature, pressure, etc varies across the atmosphere, I want a model simulation that accounts for this).

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