Figure 6

Figure 6: Approximate effective wall of finite height [80] as a function of x = − β+, compared to the classical exponential wall (upper dashed curve). Also shown is the exact wall 1 1 1 2 W (p ,p ,(V ∕p ) ) (lower dashed curve), which for x smaller than the peak value coincides well with the approximation up to a small, nearly constant shift.