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                  WARNING FROM THE PHOTCAL PACKAGE LOADER                       
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      The SDAS external package TABLES optionally used by some of the
      PHOTCAL  tasks is  not  available.  The  tasks  MKNOBSFILE  and
      MKOBSFILE  will run only on APPHOT/DAOPHOT output files written
      in  text  database  format (the default),  but  will not run on
      files written in ST tables format.