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Martin, N A; Swann, N R W; Driskell, N T*; Allott, T P*; Noyes, P A*; Bell, W; Paton Walsh, C; Woods, P T (1996) Final report to the EC (NPL contribution), contract no. EV5V-93- 0350. Ground based atmospheric trace gas measurements by tunable laser heterodyne spectrometry in the mid-infrared. NPL Report. QM 121