There is then a further heating and cooling stage in {TAIL ~ an oxidising atmosphere} which acts to remove intercalated carbon moieties from {HEAD ~ the metallic feature} 
There is then a further heating and cooling stage in { TAIL ~ an oxidising atmosphere } which acts to remove intercalated carbon moieties from { HEAD ~ the metallic feature }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD