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| abstraction > mathematical concept > number > quantity > radiation measurement > spectral feature > set of lines > fine structure | 
| fine structure comparison table | ||
| Subject | is a kind of | has definition | 
|---|---|---|
| set of lines | spectral feature | A set of absorption or emission lines in the spectra of a celestial object | 
| fine structure | set of lines | Splitting of spectral lines by the spin-orbit energy - i.e., the potential energy of the inherent electron magnetic moment in the atom's own magnetic field. | 
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