{HEAD ~ Individual signals} representing {TAIL ~ the variable power component} are combined with the error signal to provide the individual control signals for each power source 
representing
{ HEAD ~ Individual signals } representing { TAIL ~ the variable power component } are combined with the error signal to provide the individual control signals for each power source
HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH