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