Fig. 2. Illustration of progressive error correction and two-stage assembly methods of NECAT.

A A template raw read for correction, in which the block boxes indicate errors and the red rectangle is high-error-rate region. B Error correction of low-error-rate subsequences. Only low-error-rate subsequences have supporting reads. C Error correction of high-error-rate subsequences. D Contig assembling using corrected reads. E Contig bridging using raw nanopore reads. F Output final contigs.