For purposes of indexing, BRO files are considered data and will appear in these files. The remaining directories at the root level contain data files and detached PDS labels. All data files on the disc are accompanied by detached PDS labels, which describe their contents. PDS TEXT objects have attached labels. The label fully describes the format and content of its associated file.
Some data files contain more than one structure.
Coefficients and covariances in binary form are available in file JGM75D01.SHB in the SHB directory. In the IMG directory are two digital maps. There are also 105 sets of three files from the surface reflection investigation based on data collected in March 1999. These data were collected under auspices of the Mars Global Surveyor Project. G. Leonard Tyler of Stanford University was the Radio Science Team Leader.