The routine SXTPNT_SUM will read the observing log and give a summary of the
unique PFI pointing for a given time period. It groups the summary listing based on
each unique pointing location over time. See the User's Guide for a sample listing.
For the command:
IDL> sxtpnt_sum, '5-oct-93 13:00', '6-oct-93 1:00'
it will produce a file in your home directory with the name ``sxtpnt_sum.txt''
(unless you specify the output file name with the outfil keyword option).