The reduced ion mode data sweeps are stored in single orbit IEEE binary
data files which have been organized into 100 orbit subdirectories. The
directories ION and IUN contain the data and the data uncertainties,
respectively.

This directory also contains the description of the reduced ion mode data
sweeps in the file DATASET.TXT.
The /DATA directory contains a description of the ORPA instrument.
The /DOCUMENT directory contains full reproductions of all the documents.

The PDS catalog templates associated with this dataset are located in the
CATALOG directory off the root of this CD-ROM in the file called "*.CAT".