In a preferred embodiment, the outlet has {HEAD ~ a width} equal to {TAIL ~ the width} of one of the zones 
equal to
In a preferred embodiment , the outlet has { HEAD ~ a width } equal to { TAIL ~ the width } of one of the zones
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH