a flow restrictor coupled to one of the plurality of gas outlet ports, wherein the flow restrictor is sized to provide {HEAD ~ flow conditions} that are substantially equal to flow conditions of the first and second gas inlets of {TAIL ~ the processing chamber} 
a flow restrictor coupled to one of the plurality of gas outlet ports , wherein the flow restrictor is sized to provide { HEAD ~ flow conditions } that are substantially equal to flow conditions of the first and second gas inlets of { TAIL ~ the processing chamber }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL