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Fig. 6. (a) Water content at boreholes UZB-1, UZB-2, and UZB-3. Concentration profiles of tritiated water vapor (3HHOg) in units of Bq kg–1 of water in the gas phase at (b) UZB-3 borehole and (c) UZB-2 borehole for selected years (1994 data from Prudic and Striegl, 1995; 1998 data from Prudic et al., 1999).