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