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