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Fig. 3.

image

Velocity profiles of AR11641 for different times in the spot evolution. Transition from green to red in the profiles outlines the outer edge of flow field. A change in the shape of the velocity profile becomes apparent as the sunspot decays and the penumbra dissolves on 7 January 2013 at 01:30 UT. The vertical lines mark the distance to the spot for which the horizontal velocity is maximum.

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