Key points are not available for this paper at this time.
These are the data products for the paper "The Chandra Deep Field North Survey. XIII. 2 Ms Point-Source Catalogs", Alexander D.M., Bauer F.E., Brandt W.N., Schneider D.P., Hornschemeier A.E., Vignali C., et al., 2003, AJ, 126, 539
Alexander et al. (2003) studied this question.