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* Elemental—the bulk composition of a sample
 
* Elemental—the bulk composition of a sample
* Isotopic—ratios of one stable isotope to another in a sample
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* [[Wikipedia:Isotope geochemistry|Isotopic]]—ratios of one stable isotope to another in a sample
 
* Molecular—the presence and relative or absolute abundance of certain specific molecules in a sample
 
* Molecular—the presence and relative or absolute abundance of certain specific molecules in a sample
  
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