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