Is a numerator relationship matrix (599 x 599) computed from a pedigree that traced back many generations. This relationship matrix was derived using the Browse application of the International Crop Information System (ICIS), as described in https://repository.cimmyt.org/xmlui/bitstream/handle/10883/3488/72673.pdf (McLaren et al. 2000, 2005).
McLaren, C. G., L. Ramos, C. Lopez, and W. Eusebio. 2000. ``Applications of the geneaology manegment system.'' In International Crop Information System. Technical Development Manual, version VI, edited by McLaren, C. G., J.W. White and P.N. Fox. pp. 5.8-5.13. CIMMyT, Mexico: CIMMyT and IRRI.
McLaren, C. G., R. Bruskiewich, A.M. Portugal, and A.B. Cosico. 2005. The International Rice Information System. A platform for meta-analysis of rice crop data. Plant Physiology 139: 637-642.