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Fig. 1

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Overview maps of the observed FOV. Clockwise from upper left: continuum intensity in the infrared, total circular polarization of Si i, line-core intensity of Ca ii H, absorption depth of He i. The contour outlines the structure hosting the siphon flow under investigation. All maps are shown on a linear scale, the total circular polarization is scaled over a range of [− 3%, 6%] of the continuum intensity. The red line in the continuum map denotes the central spine of the structure.

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