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| English | Spanish |
| Napierian spectral internal transmittance density | densidad de transmitancia interna neperiana espectral |
| spectral internal absorptance of a homogeneous non-diffusing layer | absortancia interna espectral |
| spectral internal transmittance of a homogeneous non-diffusing layer | transmitancia interna espectral |
| spectral internal transmittance density | densidad de transmitancia interna espectral |