For a description of the FITS format see the original paper by Wells et al. The tape is left after the end of file. This command must be used before anything else can be done with the tape. Skip N files on the tape.
N can be positive or negative.
Write the scan from R memory to the tape. The scan is written at end of tape, unless you specify argument HERE . An End of Tape mark is written after the file. Although only one axis is really necessary, it is very convenient to define four, use the first one for the channels, and the three last ones to code the positions and stokes parameters. The first axis is used to define effectively the spectrum.