{TAIL ~ 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 the sample, and permits substantially the entire post sample radiation to travel from the second focusing reflector to {HEAD ~ the detector} 
{ TAIL ~ 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 the sample , and permits substantially the entire post sample radiation to travel from the second focusing reflector to { HEAD ~ the detector }
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