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Fig. 3

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The effect of the height inversion for the power of 3-min oscillations in sunspot umbrae. The panels show time-averaged spatial profiles of 3-min oscillations of the LOS velocity measured in different active regions. Thin lines correspond to the photospheric signal (Fe i), and the thick curves to the chromospheric signal (H α). The vertical dashed lines indicate the umbra-penumbra boundary.

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