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Figure 13: Observed and model simulated breakthrough curves for He, Ne,
and Br, 6 m (a), 13 m (b), and 23 m (c) from the source within the
matrix regime, where  is the porosity, b is the fracture
aperture, B is the fracture spacing, z is the distance into the matrix,
and velocity is the mean pore water velocity within the fracture
regime.
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