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Schlichenmaier, R. Volkmer, S. K. Solanki, T. Berkefeld, T. Riethm\\\"uller, T. Waldmann, W. Schmidt","submitted_at":"2016-05-20T12:36:12Z","abstract_excerpt":"Context. Investigations of the magnetism of the quiet Sun are hindered by extremely weak polarization signals in Fraunhofer spectral lines. Photon noise, straylight, and the systematically different sensitivity of the Zeeman effect to longitudinal and transversal magnetic fields result in controversial results in terms of the strength and angular distribution of the magnetic field vector.\n  Aims. The information content of Stokes measurements close to the diffraction limit of the 1.5 m GREGOR telescope is analyzed. 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