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Does anyone have a good reference for the refractive index of the near surface Martian atmosphere?

(Or alternatively, the means to estimate it from readily available data!)

I'm struggling to think of an equation for which I've got enough of the variables to be of use, (for example assuming the atmosphere is CO2, and the pressure is ~6mbar, temperature etc.)

Hope you'll be able to help. Thanks in advance!

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# Refractive index of Martian atmosphere near surface

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