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1 Introduction
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2 Radiative transfer of polarized light
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3 Asymmetric Stokes-V profiles
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4 Model of the magnetic field in the penumbra
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5 Spectral signature of penumbral flux tubes
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6 Center-to-limb variation of Stokes-V profiles
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7 Variation of the NCP along an azimuthal section
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8 Synthetic NCP maps and comparison with observations
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9 Summary
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References
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