References for the numbering systems

Col	Reference

--	---------

R1	Blanco V.M., Williams A.D. 1959, Astrophys. J. 130, 482

R2	McConnell D.J. 1968 Astrophys. J. Suppl. 16, 275

R3	Kharchenko N., et al. 2005, Astron. Astrophys. 438, 1163 (seq. numbering)

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