spec - Stef
- spectral absorption index
- spectral absorptivity
- spectral chromaticity coordinates
- spectral concentration
- spectral distribution
- spectral internal absorptance
- spectral internal transmittance
- spectral internal transmittance density
- spectral line
- spectral linear absorption coefficient
- spectral linear attenuation coefficient
- spectral linear scattering coefficient
- spectral luminous efficiency
- spectral mass attenuation coefficient
- spectral optical depth
- spectral optical thickness
