In {TAIL ~ one embodiment}, {HEAD ~ the light sensitive surface} of the light sensor integrates light passing through a cross section of the media along a scanning path of the media 
In
In { TAIL ~ one embodiment } , { HEAD ~ the light sensitive surface } of the light sensor integrates light passing through a cross section of the media along a scanning path of the media
REL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH