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