References for the numbering systems

Col	Reference

---	---------

R1	Delgado A.J., et al. 1997, Astron. J. 113, 713

R2	Becker W., et al. 1976, Basle catalogue

R3	Paunzen E., Pintado O.I., Maitzen H.M. 2003, Astron. Astrophys. 412, 721

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