The Cytoband file format is used to specify the cytobands for an imported genome. IGV uses this file to draw the chromosome ideograms for the genome.
A cytoband file is a five-column tab-delimited text file. Each row of the file describes the position of a cytogenetic band. The columns in the file match the columns of the CytoBank table in the database underlying the UCSC Genome Browser (http://genome.ucsc.edu/):