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