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