References for the numbering systems

Col	Reference

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

R1	Hartwick F.D.A., et al. 1972, Astrophys. J. 174,557

R2	Hartwick F.D.A., Hesser J.E. 1974, Astrophys. J. 192,391

R3	Kassis M., et al. 1997, Astron. J. 113, 1723 (VI file)

R4	Kassis M., et al. 1997, Astron. J. 113, 1723 (UBVI file)

R5	Eggen O.J. 1961, Roy. Obs. Bull. no 24

R6	Momany Y., et al. 2001, Astron. Astrophys. 379, 436

R7	UCAC1: sequential numbering

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