The individual input control signal for {HEAD ~ each power source} is obtained by summing the error signal with {TAIL ~ the individual signal} representing the variable component 
The individual input control signal for { HEAD ~ each power source } is obtained by summing the error signal with { TAIL ~ the individual signal } representing the variable component
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH