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spectral feature comparison table

Subject	has equivalent width	has definition	has transition
absorption edge		Sudden rises superposed on the smooth decrease of the curve of the attenuation coefficient, which cause the curve to have a typical sawtooth aspect. They generally occur at the limit of spectral lines.
set of lines		A set of absorption or emission lines in the spectra of a celestial object
spectral line		A line corresponding to an image of the entrance slit of the spectrometer, seen when light is either emitted by or interrupted by a hot rarefied gas such as hydrogen. The pattern is characteristic of the gas and the wavelength at which the features are observed to occur is indicative of the velocity of the object.

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