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Graphics Interchange Format  |  2000-06-28  |  39.9 KB  |  355x251  |  8-bit (138 colors)
   ocr: 0.03 0.02 - 0.01 - -001 002 003 -0.045 20 40 60 8D 100 120 140 Figure 3: The original signal from figure 2, after high-pass filtering.