1D/2D indexing and querying with a pair of genomic coordinates

 Pairix is a tool for indexing and querying on a block-compressed text
 file containing pairs of genomic coordinates.
 .
 Pairix is a stand-alone C program that was written on top of tabix as a
 tool for the 4DN-standard pairs file format describing Hi-C data:
 pairs_format_specification.md
 .
 However, Pairix can be used as a generic tool for indexing and querying
 any bgzipped text file containing genomic coordinates, for either 2D- or
 1D- indexing and querying.
 .
 For example: given the custom text file below, you want to extract
 specific lines from the Pairs file further below. An awk command would
 read the Pairs file from beginning to end. Pairix creates an index and
 uses it to access the file from a relevant position by taking advantage
 of bgzf compression, allowing for a fast query on large files.