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spectator ion spectral bandwidth spectral centroid spectral characteristic spectral classification
spectral color spectral density spectral dimension spectral directional reflectance factor spectral emissivity
spectral energy distribution spectral extinction spectral factorization spectral function spectral hygrometer
spectral irradiance spectral line spectral locus spectral luminosity classification spectral luminous efficacy
spectral luminous efficiency spectral measure spectral photography spectral pyrometer spectral radiance
spectral radiance factor spectral radius spectral reflectance spectral regions spectral response
spectral selective photoelectric effect spectral sensitivity spectral series spectral-shift reactor spectral temperature
spectral theorems spectral transmission spectral type Spectra Pritchard photometer spectrobolometer
spectrofluorometer spectrogram spectrograph spectrography spectroheliocinematograph
spectroheliogram spectroheliograph spectrohelioscope spectrometer spectrometry
spectrophone spectrophotometer spectrophotometric titration spectrophotometry spectropolarimeter
spectropyrheliometer spectroscope spectroscopic binary star spectroscopic displacement law spectroscopic parallax

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