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. 2011 Jan 26;469(7331):529–533. doi: 10.1038/nature09687

Table 1.

Sumatran orang-utan assembly statistics

Total contig bases 3.09 Gb
Total contig bases >Phred Q20 3.05 Gb (98.5%)
Ordered/oriented contigs and scaffolds 3.08 Gb
Number of contigs >1 kb 410,172
N50 contig length 15.5 kb
N50 contig number 55,989
Number of scaffolds >2 kb 77,683
N50 scaffold length 739 kb
N50 scaffold number 1,031
Average read depth 5.53×

Q20 refers to a score of 20 on the Phred scale of base quality scores; here we present the total number of bases in the assembly with a Phred score greater than 20 (3.05 Gb, which is 98.5% of assembled bases). N50 refers to a length-weighted median such that 50% of the genome is contained in contigs or scaffolds of the indicated size or greater.