{HEAD ~ The lens surfaces} of {TAIL ~ the first aspheric collimating lens} satisfy the following formula: 
of
{ HEAD ~ The lens surfaces } of { TAIL ~ the first aspheric collimating lens } satisfy the following formula :
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH