{HEAD ~ Individual sensors} sense {TAIL ~ the magnitude} of a variable power component from each power source and provide a signal proportional thereto 
{ HEAD ~ Individual sensors } sense { TAIL ~ the magnitude } of a variable power component from each power source and provide a signal proportional thereto
HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH