spectral energy distribution
英[ˈspektrəl ˈenədʒi ˌdistriˈbju:ʃən]美[ˈspɛktrəl ˈɛnədʒi ˌdɪstrəˈbjuʃən]
A spectral energy distribution (SED) is a plot of brightness or flux density versus frequency or wavelength of light. It is used in many branches of astronomy to characterize astronomical sources.