This creates a generally flat surface on the top of the dome with {HEAD ~ the dome} like {TAIL ~ sides} sloping away from, and generally not engaging, the diaphragm 
like
This creates a generally flat surface on the top of the dome with { HEAD ~ the dome } like { TAIL ~ sides } sloping away from , and generally not engaging , the diaphragm
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH