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