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Graphics Interchange Format  |  1998-02-10  |  18.5 KB  |  221x279  |  4-bit (16 colors)
   ocr: (a) F1 F2 F3. F4 interval of1 OP4 OP1 (b) P2 P3 -F1P1+F24P2+F34P34F44P4 Figure 1: Basis CHTLES Fl..F4in (a) are combined witb corttrol points P1.P410 produce curve Cin (b).