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spectral absorbance, <of a homogeneous non-diffusing layer>
spectral internal transmittance density
logarithm to base 10 of the reciprocal of the spectral internal transmittance,
Note 1 to entry: The spectral absorbance has unit one.
Note 2 to entry: This entry was numbered 845-04-83 in IEC 60050-845:1987.
Note 3 to entry: This entry was numbered 17-1207 and 17-1216 in CIE S 017:2011.