As will be discussed below, this ringed shaped portion establishes a reference region 86 used in distinguishing between mobile ion drift and other effects of {HEAD ~ temperature stress} on {TAIL ~ contact potential measurements} 
on
As will be discussed below , this ringed shaped portion establishes a reference region 86 used in distinguishing between mobile ion drift and other effects of { HEAD ~ temperature stress } on { TAIL ~ contact potential measurements }
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 HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL