RadTran-package         Radon and Soil Gas Transport in 2D
RnDif.het               2D Steady-state radon diffusion in a
                        heterogeneous porous medium.
RnDif.hom               2D Steady-state radon diffusion in a
                        homogeneous porous medium.
RnDifAdv.hom            2D Steady-state radon diffusion & advection in
                        a homogeneous column of sand.
SoilAdv.hom             2D Steady-state soil gas advection (Darcy Flow)
                        in a homogeneous column of sand.
