... This library defines the chip cube, which is a way of storing CCD images in FITS files; the library also provides some routines for manipulating these files. ... The chip cube is stored in the primary data array of the FITS file. ... Thus in the FITS format for storing chip cubes, an series of binary table extensions for storing GTIs, one per CCD, is an option. ... The table should have as many rows as there are CCD planes in the chip cube, and must have the following columns: . ...