{HEAD ~ a stack} supported by and depending from the main plate, the stack having anodes and cathodes, wherein the main plate defines {TAIL ~ an exhaust plenum} with the stack 
{ HEAD ~ a stack } supported by and depending from the main plate , the stack having anodes and cathodes , wherein the main plate defines { TAIL ~ an exhaust plenum } with the stack
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH