From comparison of {TAIL ~ the measured and expected values}, an offset voltage is generated and added to {HEAD ~ the CCD output signal} 
From comparison of { TAIL ~ the measured and expected values } , an offset voltage is generated and added to { HEAD ~ the CCD output signal }
OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD