saa_checker.pl is run from within lr and examines the mm*.sum file
 provided in the backstop tar file for each load.  This file contains,
 along with many other useful bits of information, the solar array
 angle (SAA) for each observation.  If an SAA is below 60 degrees, or
 above 135 degrees, the observation is listed in a text file called
 saa_check.txt. The format of this text file is that of a tab
 seperated
 list containing the obsid, start and stop times, saa and duration.  
The script can be run
 from the command line if need be provided the mm*.sum file is in the
 same directory as the script is being run from.  Though it is
 unlikely that anyone would need to run this script from the command
 line, the manual execution is as follows:
  saa_checker.pl {previous load} 
 Here, "previous load" refers to the last load that was reviewed (ie. the
 continuity to the current load under review).