{HEAD ~ Voltage values} considered in the context of the invention are {TAIL ~ absolute voltage values} of voltage phasors representing a three phase system 
are
{ HEAD ~ Voltage values } considered in the context of the invention are { TAIL ~ absolute voltage values } of voltage phasors representing a three phase system
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH