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