Whether for the segmented boundary embodiment of FIG 12 or the curved wall embodiment of FIGS 7 11, {TAIL ~ the chamber} 150 includes a first chamber wall that is disposed substantially in line with {HEAD ~ a channel wall}  
Whether for the segmented boundary embodiment of FIG 12 or the curved wall embodiment of FIGS 7 11 , { TAIL ~ the chamber } 150 includes a first chamber wall that is disposed substantially in line with { HEAD ~ a channel wall }
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 OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH