{HEAD ~ The enable signal} is routed across {TAIL ~ traces} on the one or more PCA boards 
is routed across
{ HEAD ~ The enable signal } is routed across { TAIL ~ traces } on the one or more PCA boards
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH