The collection container may be filled with the material and separating {HEAD ~ the material} to form {TAIL ~ the selected fraction} 
The collection container may be filled with the material and separating { HEAD ~ the material } to form { TAIL ~ the selected fraction }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL