The soft scaling factors are applied to {HEAD ~ the initial symbol estimates} to generate {TAIL ~ the soft estimates} 
to generate
The soft scaling factors are applied to { HEAD ~ the initial symbol estimates } to generate { TAIL ~ the soft estimates }
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL