This is a subset of a much larger Mars Global Surveyor dataset.
It is difficult to download datasets consisting of many files
from NASA's Planetary Data System, so this dataset was
subsetted and downloaded from the instrument PI web site:


http://www-star.stanford.edu/projects/mgs/tps-public.html

The Original data directory contains a Python script for processing
data files you can download from the above site. The main limitation of
the dataset is that the geometry of the orbit rather severely
restricts the combinations of times of day, season and latitude
for which observations can be obtained. For example, it is not
possible to get a noontime summer temperature, and even late afternoon
summer Northern Hemisphere profiles are not possible.

The naming convention for the original TPS radio occultation files is
YDOYHMMV.TPS, where Y is the last digit of the year of the recording,
DOY is the day-of-year, H is the hour (i.e. A = 0, B = 1, ..., X = 23),
MM is the minute, and V is a one-character version identifier. For
example, file 8028D38A.TPS was recorded on day 028 of 1998 at 03:38 UTC.
The .txt files in the Workbook dataset directory are extracted from
the corresponding .TPS files.  The .txt files contain only temperature 
and pressure, and have header information at the beginning to make
them easier to read in and work with. The original files contain
additional information, such as altitude and the error bars of
temperature and pressure.

There are also some data files with a G character in place of the year
digit.  These are probably from the orbit insertion phase at the
beginning of the mission, but I am not certain.