{HEAD ~ The iteration process} continues until the predicted values match the measured values within a desired degree of {TAIL ~ tolerance} 
{ HEAD ~ The iteration process } continues until the predicted values match the measured values within a desired degree of { TAIL ~ tolerance }
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL