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