This disk includes an archive volume Software Interface Specification (VOLSIS) document for the Mars Global Surveyor Magnetometer and Electron Reflectometer (MAG/ER). Three versions of this document exist in the DOCUMENT directory of the disk.
Other documentation for the Mars Global Surveyor mission, spacecraft, instruments, and data can be found in the catalog files for the disk.
All three versions of the VOLSIS document describe the structure and content of the data in the MAG/ER archive.