In contrast, LIF detection suffers from {HEAD ~ the exited molecules} emitting in {TAIL ~ many frequencies} and directions 
emitting in
In contrast , LIF detection suffers from { HEAD ~ the exited molecules } emitting in { TAIL ~ many frequencies } and directions
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH