| English | Spanish |
| spectral linear absorption coefficient at a point in an absorbing medium, for a collimated beam of radiation | coeficiente de absorción lineal espectral |
| spectral linear attenuation coefficient at a point in an absorbing and diffusing medium, for a collimated beam of radiation | coeficiente de atenuación lineal espectral |
| spectral linear scattering coefficient at a point in a diffusing medium, for a collimated beam of radiation | coeficiente de difusión lineal espectral |