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Confirmation of signal accumulation (captured at 12.5 Mfps; the LD is applied every four frames; only very weak images appear for the usual first image capture, and they become clearer with increase of the accumulation times; no afterimage appears even after five-time accumulation with 1525 [5 × 305] transfer steps on each looped CCD, proving a reasonable transfer efficiency at least up to 12.5 Mfps).
