A single IAM dataset is held in a single unix file. The first parameter (RA) for the first object occupies the first four bytes of the file, followed by the rest of the parameters for that object in the order listed above. The last parameter for the first object (CORMAGCAL) is followed immediately by the first parameter for the second object, and so on throughout the file. The file is suitable for reading either using unformatted FORTRAN reads, or by using standard C functions.