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A variety of instruments are used at the measurement sites.
The cavity ring-down spectrometer (CRDS) is used to measure carbon dioxide and methane.
The GC-MD is used to measure hydrogen, carbon monoxide, nitrous oxide and sulphur hexafluoride.
The GC-ECD is used to measure nitrous oxide and sulphur hexafluoride.
The Medusa-GCMS can measure a wide range of species through the use of pre-concentration techniques.