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