tokens: We acknowledge Dr. Angeles Pérez-Villegas for critical reading of the manuscript and useful suggestions. This work was supported by the São Paulo State Science Foundation, FAPESP, and the Brazilian National Research Council, CNPq. R.S.S.V. acknowledges FAPESP grant 2015/10577-9. This work has made use of the facilities of the Laboratory of Astroinformatics (IAG/USP, NAT/Unicsul), whose purchase was made possible by FAPESP (grant 2009/54006-4) and the INCT-A. We acknowledge the anonymous referee for the detailed review and for the helpful suggestions which allowed us to improve the manuscript.
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