{TAIL ~ The imaging unit} is arranged in front of the photosensor array such that it maps an image of said array of {HEAD ~ LEDs} on said photosensor array 
{ TAIL ~ The imaging unit } is arranged in front of the photosensor array such that it maps an image of said array of { HEAD ~ LEDs } on said photosensor array
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 HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH