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Related to spectrum line: Emission lines
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|Noun||1.||spectrum line - an isolated component of a spectrum formed by radiation at a uniform frequency|
line - a mark that is long relative to its width; "He drew a line on the chart"
spectrum - an ordered array of the components of an emission or wave
fine structure - the presence of groups of closely spaced spectrum lines observed in the atomic spectrum of certain elements; "the fine structure results from slightly different energy levels"
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