{HEAD ~ The wall thicknesses} of {TAIL ~ the walls} 180 are very small and are typically in the range between 0.5 mm and 0.05 mm, as a result of which a construction of many parallel ducts with a large total opening cross section is implemented 
of
{ HEAD ~ The wall thicknesses } of { TAIL ~ the walls } 180 are very small and are typically in the range between 0.5 mm and 0.05 mm , as a result of which a construction of many parallel ducts with a large total opening cross section is implemented
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH