{HEAD ~ Light imaging elements} in the bottom of the fluid channel may be used to image {TAIL ~ the object} 
used to image
{ HEAD ~ Light imaging elements } in the bottom of the fluid channel may be used to image { TAIL ~ the object }
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL