* Parameters control whether gaps in exon (mapped) and intron (unmapped)
* regions are preserved. Gaps that connect introns to exons are treated
* conservatively, i.e. only preserved if both intron and exon gaps are
* Parameters control whether gaps in exon (mapped) and intron (unmapped)
* regions are preserved. Gaps that connect introns to exons are treated
* conservatively, i.e. only preserved if both intron and exon gaps are