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