{TAIL ~ The photosensor array} is divided into {HEAD ~ subareas} each detecting light output from a single one of said LEDs 
{ TAIL ~ The photosensor array } is divided into { HEAD ~ subareas } each detecting light output from a single one of said LEDs
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH