Figure 2

Mapping precision. The effect of allowing imperfect and/or multiple mappings of sequence reads. The pie chart shows the fraction of reads that map perfectly to only one unique place in the genome (PU), map imperfectly, but still to one unique place in the genome (IU), map perfectly but redundantly two to five places in the genome (PR), map imperfectly and redundantly (IR), or map repetitively, more than five places, either perfectly (repP) or imperfectly (repI). The majority of reads map uniquely to one place in the genome, both for perfect and imperfect matches.