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Fig. 3.

image

Snapshot of Dopplergrams from Fe Iλ 5576 Å for the four different models (left to right: increasing average magnetic flux density from 0 to 100 G), estimated using (a) the COG method which provides the velocity field around z = 100 km and (b) the line-minima shift which provides the velocity field around z = 400 km

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