{HEAD ~ The power and signal buses} of the mesh system run in both vertical and horizontal directions across the array such that {TAIL ~ all the vertical buses} lie in one metal layer, and all the horizontal buses lie in another metal layer 
{ HEAD ~ The power and signal buses } of the mesh system run in both vertical and horizontal directions across the array such that { TAIL ~ all the vertical buses } lie in one metal layer , and all the horizontal buses lie in another metal layer
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD 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 OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH