In other embodiments, the pedestals 46 may be offset along a line generally orthogonal to a direction of {HEAD ~ an average flow} of {TAIL ~ gas} 51 through the cavity 14 
In other embodiments , the pedestals 46 may be offset along a line generally orthogonal to a direction of { HEAD ~ an average flow } of { TAIL ~ gas } 51 through the cavity 14
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH