{HEAD ~ This illumination} follows {TAIL ~ a path} through the objective toward the sample, and again, after reflection, through the objective toward the detector 
follows
{ HEAD ~ This illumination } follows { TAIL ~ a path } through the objective toward the sample , and again , after reflection , through the objective toward the detector
HEAD HEAD HEAD HEAD HEAD HEAD 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