Berkeley 6

Number of stars per data source

	Reference  524 : 2697 stars
	Reference  543 : 1991 stars

524: Zacharias N., Monet D.G., Levine S.E., Urban S.E., Gaume R., Wycoff G.L.; (2005) The Naval Observatory; The Naval Observatory Merged Astrometric Dataset (NOMAD)
543: Lata S., Pandey A.K., Kumar B., Bhatt H., Pace G., Sharma S.; (2010) Astron. J. 139, 378; A Deep UBVRI CCD Photometry of Six Open Star Clusters in the Galactic Anticenter Region; 2010AJ....139..378L