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Graphics Interchange Format  |  1996-07-02  |  24KB  |  471x337  |  4-bit (16 colors)
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OCR: FIGURE 1 Spectrum for a square wave. 1.4 1.2 0.8 .0.6 Amplitude 0.4- 0.2 0 -17 -13 -9. 45 7 11 15 Frequency