47.86% HumanHap300). In the combined data from both arrays, 39.79% of the copy number variants are covered by at least five SNP on the array (25.63% Human-1; 37.34% HumanHap300) and thus it should be possible to detect them using QuantiSNP (details in Supplementary Table 3A). We also performed a detailed analysis mapping the SNPs on the arrays to all events (redundant) in the same database and this shows a similar coverage of every single event (Supplementary Table S3B).