No transmission around the slit is allowed.
example for an input file
# user defined geometry
# x(i) y(i) r(i) [m]
0.02 0.03 0.01
-0.04 0.015 0.005
warning: at least two values must be in the file
Example: multi_pipe(xmin=-0.01, xmax=0.01, ymin=-0.01, ymax=0.01)
WARNING: This is a contributed Component.
Parameters in boldface are required;
the others are optional.