In this circuit, {HEAD ~ the number} of guard bits required to guarantee {TAIL ~ round off accuracy} is only two 
required to guarantee
In this circuit , { HEAD ~ the number } of guard bits required to guarantee { TAIL ~ round off accuracy } is only two
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH