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Figure 1: Change of the Modulation Transfer Function when the effects of the different parts of the optical system are sequentially taken into account: telescope aperture (``Airy''), central obscuration, secondary mirror and spider, sampling (CCD), and a defocus of 1.5 mm (about 9 steps of the focus mechanism). |
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Figure 2: Normalized histograms of the continuum-intensity values at 630 nm, obtained for 35 equal bins between 0.6 and 1.4 of the mean intensity. Shown are results for the original synthetic image from the simulation snapshot (outermost, solid curve) and for the degraded images corresponding to the MTFs shown in Fig. 1 (same line styles as used there). The two thick inner curves represent the degraded synthetic image assuming a defocus of 1.5 mm (thick dashed curve) and the continuum map observed with Hinode SP (thick solid curve). |
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Figure 3: Intensity contrast as a function of telescope defocus. Shown are results for a SP data set used taken on Jan. 16, 2007, 10:54:14-11:06:52 UT (diamonds) and the contrast values for the degraded simulation image (crosses). The value for the large map used to compare with the simulation is indicated by the asterisk, assuming that the location of the optimal focus was the same as for the other dataset. This also gives an indication of the observational uncertainty. |
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Figure 4: Continuum images at 630 nm from the simulation snapshot with original resolution ( left) and after degrading ( middle), in comparison with a detail of the observed Hinode/SP map of the same size ( right). The periodic simulation box is shown fourfold for better visibility. |
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