If so, the power grid planner modifies via or via array locations and reduces the number of vias or via arrays of the power grid structure to determine refined dimensions and {HEAD ~ locations} of {TAIL ~ power grid components} 
of
If so , the power grid planner modifies via or via array locations and reduces the number of vias or via arrays of the power grid structure to determine refined dimensions and { HEAD ~ locations } of { TAIL ~ power grid components }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL