More specifically, FIG 2 shows a graph of {HEAD ~ different void growth rates} over {TAIL ~ EM stress time} 
More specifically , FIG 2 shows a graph of { HEAD ~ different void growth rates } over { TAIL ~ EM stress time }
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL