integral of the spectral linear attenuation coefficient, μ(x, λ), of the medium between the points x1 and x2, as given by the equation Note 1 to entry: The spectral optical thickness is used in atmospheric physics and physical oceanography. Note 2 to entry: The spectral optical thickness has unit one. Note 3 to entry: This entry was numbered 845-04-80 in IEC 60050-845:1987.
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