A cuvette has been used to exemplify one embodiment of {TAIL ~ the invention} involving {HEAD ~ a flow} through system 
A cuvette has been used to exemplify one embodiment of { TAIL ~ the invention } involving { HEAD ~ a flow } through system
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH