Thus like prior art prior clock subtree models, a subtree model in accordance with the invention depicts {HEAD ~ the maximum and minimum delays} between {TAIL ~ the root} of a subtree and the sinks connected to the subtree as functions of the transition times of the rising and falling edges of the clock signal as it arrives at the root of the subtree 
between
Thus like prior art prior clock subtree models , a subtree model in accordance with the invention depicts { HEAD ~ the maximum and minimum delays } between { TAIL ~ the root } of a subtree and the sinks connected to the subtree as functions of the transition times of the rising and falling edges of the clock signal as it arrives at the root of the subtree
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL 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 OTH OTH OTH