Exon boundary detection for tiling array and RNA-Seq. For every TAR, we computed its offset from its overlapping exon (excluding those that did not overlap with exactly one exon). (a) RNA-Seq has a median offset of 0 bp and a median absolute deviation of 2 bp, whereas (b) the tiling array has a median offset of 7 bp and a median absolute deviation of 25 bp. (c) Pictorial representation of how offsets were calculated. A negative offset means the TAR (orange) falls short of the exon (green) boundary and a positive offset means the TAR extends beyond the exon.