References for the numbering systems

Col	Reference

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

R1	Phelps R.L., Janes K.A., Montgomery K.A. 1994, Astron. J. 107, 1079

R2	Piatti A.E., et al. 1998, Astron. J. 116, 801 (VI data)

R3	Piatti A.E., et al. 1998, Astron. J. 116, 801 (BVI data)

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