An inert gas, such as {HEAD ~ N2} is then blown over {TAIL ~ the coated substrate} 
An inert gas , such as { HEAD ~ N2 } is then blown over { TAIL ~ the coated substrate }
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL