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The line profile for a spectral line is a representation of its spectral intensity as a function of frequency or wavelength. The line may appear in emission or absorption toward an astronomical source. Various physical processes can act to modify the natural line profile, such as Doppler, turbulent, or collisional broadening.
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Charnley, S.B. (2023). Line Profile. In: Gargaud, M., et al. Encyclopedia of Astrobiology. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-65093-6_888
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