Rather, in {HEAD ~ the case} of virgin workpieces, it is believed that machining the component, such as an SiC boat, produces particles which deposit upon {TAIL ~ the surface} of the component 
Rather , in { HEAD ~ the case } of virgin workpieces , it is believed that machining the component , such as an SiC boat , produces particles which deposit upon { TAIL ~ the surface } of the component
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH