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tokens: ACKNOWLEDGEMENTS The Torino polarimeter was built at the INAF (Instituto Nazionale Di Astrofisica) – Torino Astrophysical Observatory using dedicated funds provided in the framework of the INAF PRIN 2009 program. This work is based on data obtained at the C2PU (Centre Pédagique Planète et Univers) facility (Calern observing station, Observatoire de la Côte d’Azur, Nice, France) and at the Rozhen National Astronomical Observatory (Bulgaria). GB, ZD, TB, IB, AC, SB, and YK gratefully acknowledge observing grant support from the Institute of Astronomy and Rozhen National Astronomical Observatory, Bulgarian Academy of Sciences.