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