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