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Fig. 14


Daily mean SODISM II observed solar radius with refraction correction as a function of time for different wavelengths. For all wavelengths, we obtained a negative slope of about 12 mas per year, which is not significant when compared with the 1σ uncertainty obtained on the mean radius (between 100 and 200 mas in Table 6). Any long-term instrumental degradation of the PSF or focus would lead to a slightly lower radius estimate.

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