Results: Singletons. aSupported normal singletons. In this histogram, the number of normal deletions defined by exactly one mapping is shown w.r.t. the number of mappings in the tumor data set supporting the deletion. E.g., there were 50 singletons supported by eight mappings. The numbers are based on the tumor-subset only. Chromosome 18 is not included, because the computation did not finish within reasonable time limits.