The support member may provide a compliant fluid seal and allow {HEAD ~ the edges} of the optical surfaces to {TAIL ~ pivot}, reducing spherical and other aberrations 
to
The support member may provide a compliant fluid seal and allow { HEAD ~ the edges } of the optical surfaces to { TAIL ~ pivot } , reducing spherical and other aberrations
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH