The ONMS Data directory is divided into three subdirectories:
NEUTRAL contains 2 neutral composition directories - each with one dataset
  12S contains a 12 second resolution dataset
  HIRES contains a high resolution dataset
SPRTHRML contains three subdirectories:
  ION_LOC  contains a superthermal ion location dataset,
  ION_MAX  contains a ion max dataset, and
  OXYGEN contains 2 superthermal oxygen directories - each with one datasets
      12S contains a 12 second resolution dataset
      HIRES_RES contains a high resolution dataset
THRM_ION contains a thermal ion dataset.

The data are presented as ASCII versions in the UADS format in which the
data were originally submitted to PDS.

This directory contains descriptions about the ONMS instrument, data process-
ing, parameters, and software. The files use the extension ".TXT." Dataset
descriptions can be found within the individual dataset directories.

All these descriptions were extracted from the project documentation. For
the complete and comprehensive collection, the document can be found as
/DOCUMENT/ONMS.ASC

The time and orbit range of each dataset is as follows:
====================================================================
DATA SET NAME    TYPE   ORBIT RANGE  DATE RANGE          PROCESSED
Neutral density LORES      3   1978-12-07T14:30:47.000Z        12/13/88
                         640   1980-09-05T17:14:34.016Z
 
                        4961   1992-07-06T00:26:53.847Z        06/01/93
                        5055   1992-10-07T19:49:39.752Z
-------------------------------------------------------------------------------
Neutral density HIRES      3   1978-12-07T14:29:47.668Z        12/13/88
                         640   1980-09-05T17:15:20.875Z
 
                        4961   1992-07-06T00:23:50.044Z        06/01/93
                        5055   1992-10-07T19:50:36.144Z
-------------------------------------------------------------------------------
Superthermal O+ LORES      1   1978-12-07T15:07:22.817Z        01/06/92
                        4468   1990-11-21T02:01:19.648Z
 
                        4494   1991-03-27T01:25:54.275Z        01/06/92
                        4975   1992-07-20T00:22:15.544Z
-------------------------------------------------------------------------------
Superthermal 0+ HIRES      1   1978-12-05T15:07:07.496Z        01/06/92
                        2780   1986-07-16T23:27:40.773Z
 
                        3415   1988-04-12T02:10:04.768Z
                        4368   1990-11-21T02:01:57:180Z
 
                        4494   1991-03-27T01:25:43.330Z        01/06/92
                        4975   1992-07-20T00:22:49.919Z
-------------------------------------------------------------------------------
Superthermal    LOC        1   1978-12-05T15:06:25.000Z        01/06/92
                         645   1980-09-10T17:30:20.000Z
 
                        4710   1991-12-29T00:40:49.000Z
                        5055   1992-10-07T19:50:29.000Z
-------------------------------------------------------------------------------
Superthermal    MAX        1   1978-12-05T15:06:31.820Z        01/06/92
                        5055   1992-10-07T19:50:28.680Z
-------------------------------------------------------------------------------
Thermal ion     LORES    466   1980-03-15T10:26:29.656Z        06/01/93
                        5055   1992-09-25T23:09:39.859Z
-------------------------------------------------------------------------------