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Graphics Interchange Format  |  1997-01-13  |  34.3 KB  |  459x512  |  4-bit (15 colors)
   ocr: FIGURE 1 Second-order filter. 15 9-02/1 - - - - lU . - 0 - - 5 n 0.6 0.8 ) 10 1.2 14 Ist orler 1.6 -10 1.8 2.0 -151 20 25 30 35 40 0.01 0.1 0 Nomalized Frequency