PDS_VERSION_ID        = PDS3                                                  
RECORD_TYPE           = STREAM                                                
OBJECT                = TEXT                                                  
  PUBLICATION_DATE      = 2000-08-30                                          
  NOTE                  = "DATAINFO.TXT describes the Magnetometer/Electron   
                           Reflectometer (MAG/ER) data and ancillary data     
                           available on this volume."                         
END_OBJECT            = TEXT                                                  
END                                                                           
                                                                              
The DATA directory contains the Magnetometer/Electron Reflectometer           
(MAG/ER) data and ancillary data.  The subdirectories of the DATA             
directory are:                                                                
                                                                              
                                                                              
  ANCIL       Contains ancillary data pertaining to the spacecraft and        
              its trajectory, in the form of kernel files.                    
                                                                              
  ER          Contains data from the Electron Reflectometer (ER).             
                                                                              
  MAG         Contains data from the Magnetometer (MAG), in                   
   |          2 subdirectories:                                               
   |                                                                          
   +- SUNSTATE     Contains MAG data expressed in Sun-State (SS)              
   |               coordinates.                                               
   |                                                                          
   +- PCENTRIC     Contains MAG data expressed in Planetocentric (PC)         
                   coordinates.                                               
                                                                              
In addition to the data files, this disk contains documentation files         
which describe the datasets on the disk, the instruments from which the       
data came, and the Mars Global Surveyor spacecraft and mission. These         
files are found in the CATALOG and DOCUMENT directories, and are              
described in the files CATALOG/CATINFO.TXT and DOCUMENT/DOCINFO.TXT.          
                                                                              
This disk also contains browse plots (PostScript files) summarizing the       
MAG and ER data on the disk. These plots are contained in subdirectories      
of the BROWSE directory.                                                      
                                                                              
In addition to accessing data files directly, users with Web browsers         
can access them via links in the HTML files MAGDATA.HTM and ERDATA.HTM        
in the EXTRAS directory. Such users also can navigate the entire disk         
using the file AAREADME.HTM in the disk root directory.