The associated optics of {HEAD ~ light source} 314 may collimate the light, and measure off {TAIL ~ axis scatter}, such as SALS and FALS scatter 
The associated optics of { HEAD ~ light source } 314 may collimate the light , and measure off { TAIL ~ axis scatter } , such as SALS and FALS scatter
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH