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Table 3 Coverage drop after B-tail removal

From: Evaluation of genomic high-throughput sequencing data generated on Illumina HiSeq and Genome Analyzer systems

Remaining per-base coverage after B-tail removal Number of positions with this coverage in the ZR reference (Bv-95nt data) Number of positions with this coverage in the PhiX reference (PhiX-95nt data)
90 to 100% 41,130 (40.26%) 4,016 (91.65%)
80 to 90% 4,056 (3.97%) 266 (6.07%)
60 to 80% 1,711 (1.67%) 100 (2.28%)
40 to 60% 310 (0.30%) 0 (0.00%)
20 to 40% 76 (0.07%) 0 (0.00%)
0 to 20% 29 (0.03%) 0 (0.00%)