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Fig. 9


Top: sketch of a simple atmospheric model capable of producing 3LPs in penumbrae at disk center (panel a)) and larger heliocentric angles (panel b)). B1, B2, v1 and v2 represent magnetic field strength and velocity in the lower and upper atmospheric layer. The LOS is parallel to the local vertical z at disk center and seen under the projection of Θ for increasing heliocentric angles. Middle: Hinode-SP intensity image of a sunspot at disk center (panel c)) and off center (panel d)). Regions with 3LPs are indicated in red, and regions with RPPs are shown in blue. Bottom: same as above, but for GRIS observations. The black and white contours indicate the penumbral boundaries, and the white arrow points to the center of the solar disk.

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