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Fig. D.1.

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Ratio of pixel signals as a function of the SoHO Sun-distance and the associated fit: (top) ratio of the north-south pixels to the central pixels (crosses), fit (green line); (middle) ratio of the east-west pixels to the central pixels (crosses), fit (orange line); (bottom) ratio of the Guiding pixels to the central pixels (crosses), fit (red line).

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