Because of its proximity to {HEAD ~ the floor} of {TAIL ~ the tubing} 50, the apertures 51 are typically distributed more closely together than if the tubing were higher such as the tubing 19 in FIG 3 
of
Because of its proximity to { HEAD ~ the floor } of { TAIL ~ the tubing } 50 , the apertures 51 are typically distributed more closely together than if the tubing were higher such as the tubing 19 in FIG 3
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH