A method 3, wherein {HEAD ~ said step} of providing {TAIL ~ a flow} of gas across said opening is performed inside of said oven region adjacent said opening 
of providing
A method 3 , wherein { HEAD ~ said step } of providing { TAIL ~ a flow } of gas across said opening is performed inside of said oven region adjacent said opening
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH