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tokens: The authors thank the anonymous referee for constructive comments that helped to improve the manuscript and presentation of the results. The research work was funded by the Austrian Science Fund (FWF): P27765 and P23618. The model calculations have been carried out at VSC (project P70068, H. Muthsam). We thank Luis Bellot Rubio from the Instituto de Astrofisica de Andalucia (CSIC) supplying the inverted SUNRISE IMaX data used in this paper.