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The relationship of (a) water δ18O and (b) DIC δ13C with 14C in DIC. The trendlines, R2 and p values for pooled intermediate (90–150 m bgl) and deep aquifer (>150 m bgl) samples are indicated. A similar pattern to (a) is also observed for δ2H (not shown, R2 = 0.60 and p = 1×10−4).
