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