BED coordinate ranges are defined as [start, end), where start marks the beginning of a genomic segment and end is one-beyond-the-end of the genomic segment.
Example:
chr1 10 20
denotes the genomic segment on chr1, starting from base 10 to base 19, inclusively. Coordinates may be interpreted as 0-based or 1-based, however. A person may interpret these coordinates as the 10th-19th on chr1, or the 11th-20th if counting starts at base 0. Such an interpretation does not change answers produced by BEDOPS. While the official BED format does specify that everything is 0-based, we support a more relaxed (more general) version of the format in several ways.
