The Data directory is divided into 5 sub-directories, each containing DATA
files for a different PVO ORPA component. The 4 components
include: 1) Reduced thermal electron mode sweeps (directory THRM_ELE),
         2) Reduced ion mode sweeps (directory ION), 
            which contains uncertainties (directory IUN),
         3) Reduced photoelectron mode sweeps (directory PHOTOELE), and
         4) Low Resolution (UADS) data (density, temperature, S/C potential)
            (directory UADS).
The sub-directories are further divided to create groups of 100 orbit files
per directory.

Catalog information (metadata) associated with this data archive are located
in the /CATALOG/*.CAT files.

The original documents describing the structure of the data files, the
instrument, and other related papers are reproduced in ASCII form as *.ASC
files, in the /DOCUMENT directory. The /DOCUMENT directory also contains the
scanned image "GIF89A" files which contain useful graphics describing the
various instruments, as well as full representations available in an HTML
document.

In each of the data directories as part of the PDS label, ".FMT" files exist
explaining the structure of the data files as described by the original
document.