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Section Time-Dependent::Absorbing Boundaries
Type block

Set the shape of the absorbing boundaries. Here you can set the inner and outer bounds by setting the block as follows:

   inner | outer | "user-defined"

The optional 3rd column is a user-defined expression for the absorbing boundaries. For example, $r$ creates a spherical absorbing zone for coordinates with ${\tt inner} < r < {\tt outer}$, and $z$ creates an absorbing plane. Note, values outer larger than the box size may lead in these cases to unexpected reflection behaviours. If no expression is given, the absorbing zone follows the edges of the box (not valid for user-defined box).

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