NGC 3680

Number of stars per data source

	Reference   10 :    9 stars
	Reference   17 :   11 stars

10: Claria J.J., Lapasset E.; (1983) J. Astrophys. Astron. 4, 117; Astrophysical properties of red giants in three open clusters older than the Hyades; 1983JApA....4..117C
17: Canterna R., Geisler D., Harris H.C., Olszewski E., Schommer R.; (1986) Astron. J. 92, 79; Washington photometry of open cluster giants: the metal-rich clusters; 1986AJ.....92...79C