This solution is then preferably removed from the matrix forming material by {HEAD ~ vacuum} drying {TAIL ~ the layer} at an elevated temperature 
drying
This solution is then preferably removed from the matrix forming material by { HEAD ~ vacuum } drying { TAIL ~ the layer } at an elevated temperature
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH