Alternatively, {HEAD ~ the isotropic pitch product} containing {TAIL ~ metals} from either of the foregoing methods can be solvent fractionated at supercritical extraction conditions to produce a metals containing mesophase pitch 
containing
Alternatively , { HEAD ~ the isotropic pitch product } containing { TAIL ~ metals } from either of the foregoing methods can be solvent fractionated at supercritical extraction conditions to produce a metals containing mesophase pitch
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH