{HEAD ~ a fully reflecting flat beam dividing mirror} which, in the reflectance mode, causes approximately half of such collimated radiation to be reflected by the second focusing reflector toward {TAIL ~ the sample}, and permits substantially the entire post sample radiation to travel from the second focusing reflector to the detector 
{ HEAD ~ a fully reflecting flat beam dividing mirror } which , in the reflectance mode , causes approximately half of such collimated radiation to be reflected by the second focusing reflector toward { TAIL ~ the sample } , and permits substantially the entire post sample radiation to travel from the second focusing reflector to the detector
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