References for the numbering systems

Col	Reference

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

R1	Rosvick J.M. 1995, Mon. Not. R. Astron. Soc. 277, 1379

R2	Burkhead M.S., et al. 1972, Astron. J. 77,661

R3	Carraro G., et al. 2001, Astron. Astrophys. 372, 879 (BV data)

R4	Carraro G., et al. 2001, Astron. Astrophys. 372, 879 (JK data)

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