{HEAD ~ The reflectance illumination} is directed toward the objective and {TAIL ~ sample} by a fully reflective mirror, which injects approximately half of the interferometer beam into the microscope, and permits substantially all of the reflected beam to reach the detector 
is directed toward
{ HEAD ~ The reflectance illumination } is directed toward the objective and { TAIL ~ sample } by a fully reflective mirror , which injects approximately half of the interferometer beam into the microscope , and permits substantially all of the reflected beam to reach the detector
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