In {TAIL ~ some embodiments} the pedestal also has a surrounding shroud defining {HEAD ~ an annular pumping passage} around the pedestal 
In { TAIL ~ some embodiments } the pedestal also has a surrounding shroud defining { HEAD ~ an annular pumping passage } around the pedestal
OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH