In one embodiment, {TAIL ~ the exposure period} of laser 177 is set by observing {HEAD ~ the physical effects} of the infrared light on a test suspension 14 
In one embodiment , { TAIL ~ the exposure period } of laser 177 is set by observing { HEAD ~ the physical effects } of the infrared light on a test suspension 14
OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH