{TAIL ~ The header} can have {HEAD ~ a thickness} substantially less than the probe diameter and can comprise a flange about an edge of the header 
{ TAIL ~ The header } can have { HEAD ~ a thickness } substantially less than the probe diameter and can comprise a flange about an edge of the header
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH