References for the numbering systems

Col	Reference

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

R1	Kassis M., et al. 1997, Astron. J. 113, 1723 (VI file)

R2	Kassis M., et al. 1997, Astron. J. 113, 1723 (UBVI file)

R3	Kaluzny J. Richtler T. 1989, Acta Astr. 39, 139

R4	Frinchaboy P.M., et al. 2006, Astron. J. 131, 922

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