A trial control setting vector is thus calculated by applying {HEAD ~ the update} to the initial value for {TAIL ~ the current iteration} 
A trial control setting vector is thus calculated by applying { HEAD ~ the update } to the initial value for { TAIL ~ the current iteration }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL