{HEAD ~ Channels} in the press block extend to {TAIL ~ the extension openings} in the gasket to allow flow of reagent into and out of the active volume, which is confined to the thickness of the gasket and can thus be minimized 
extend to
{ HEAD ~ Channels } in the press block extend to { TAIL ~ the extension openings } in the gasket to allow flow of reagent into and out of the active volume , which is confined to the thickness of the gasket and can thus be minimized
HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH REL REL TAIL 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 OTH OTH OTH OTH OTH