Tyson & Gal 1993, AJ, 105, 1206

1) Separated mail headers, table data, and Fortran program.

2) Separated descriptions from table data (TABLE3.DAT and TABLE3.DOC).  One
   minor editing change made to TABLE3.DOC, substituting "The FORTRAN 77 code
   that generated the table follows" with "The FORTRAN 77 code that generated
   the table is given in file twilight.f".

3) Generated ABSTRACT.DOC, title and abstract from the paper.

----- For AAS CD-ROM Volume IV -----

1) Converted TABLE3.DOC into CDS-style TABLE.DOC