The optical surfaces have a high value of elastic modulus, reducing coma and {TAIL ~ other aberrations} associated {HEAD ~ gravity} and acceleration 
The optical surfaces have a high value of elastic modulus , reducing coma and { TAIL ~ other aberrations } associated { HEAD ~ gravity } and acceleration
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD OTH OTH