In one embodiment, the detector is a low resolution CCD array and the position controller includes an electronic controller and a look up table in a memory that provides adjustment data in {HEAD ~ response} to {TAIL ~ the signals} from the detector 
to
In one embodiment , the detector is a low resolution CCD array and the position controller includes an electronic controller and a look up table in a memory that provides adjustment data in { HEAD ~ response } to { TAIL ~ the signals } from the detector
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