A press block is engaged against the gasket to fully enclose {HEAD ~ an active volume} between the press block, the peripheral walls of the central opening in the gasket, and {TAIL ~ the active surface} of the substrate 
between
A press block is engaged against the gasket to fully enclose { HEAD ~ an active volume } between the press block , the peripheral walls of the central opening in the gasket , and { TAIL ~ the active surface } of the substrate
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH