References for the numbering systems

Col	Reference

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

R1	Herbst W. 1977, Astron. J. 82, 902

R2	Bayer C., et al. 2000, Astron. Astrophys. Suppl. 147, 99

R3	McSwain M.V., Gies D.R., 2005, ApJS 161, 118

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