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Fig. 4

HMI images taken at 09:36 UT, exposure time 720 s, shown at the resolution of our simulations. Left: intensity showing empirical limb darkening and a small sunspot at NE; middle: Dopplergram shown with the same color code as in Fig. 3; right: magnetogram showing positive (white) and negative (black) magnetic polarities.
This figure is made of several images, please see below:
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