References for the numbering systems

Col	Reference

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

R1	Walker M.F. 1959, Astrophys. J. 130, 57

R2	Herbig G.H., Dahm S.E. 2002, Astron. J. 123, 304

R3	Forte J.C., Orsatti A.M. 1984, Astron. J. 56, 211 (seq. numbering)

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