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Fig. 2


a) IBIS Fe 617.3 nm power map at 3 mHz. b) IBIS Ca   854.2 nm power map at 3 mHz. c) IBIS Fe 617.3 nm power map at 5 mHz. d) IBIS Ca 854.2 nm power map at 5 mHz. Continuous contours indicate approximatively the position of the umbra.

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