Three-dimensional structure of the sunspot in the local reference frame. Continuum intensity is plotted at constant log τ = 0 in gray scale. Magnetic field lines are illustrated with a color scale showing the magnetic field strength at the corresponding location from lower than 200 G (purple) to higher than 2000 G (red). Middle panel: detailed view of the light bridge region (delimited by the light blue box in the top panel and from the point of view indicate by the eye in top panel) and some selected field lines obtained from the analysis of the deconvolved maps (see Sect. 2.1). Bottom panel: detailed view of the light bridge region (same region as illustrated in the middle panel) and some selected field lines obtained from the analysis of the original non-deconvolved maps (see Sect. 2.1). In the middle and bottom panels the z-axis has been expanded by a factor three. The three-dimensional structure is illustrated as a movie in the online edition. In that movie the arrows indicate the velocity flows.
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