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The effects of optical path length on absorption coefficients of bands centered at (a) 15 μm, (b) 2 μm, and optical thickness at band center, overlap parameter and its reciprocal at band centered at (c) 2 μm, and absorption coefficient of band centered at (d) 4.3 μm across the troposphere. Regions 1–3 are defined by overlap parameter in Eqs. (2), (3), and (4).
