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