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"~~r" line,  Guide will only show this data in the Remarks, i.e.,  when
you click for more info.

   Because "Color index" is in carets (^),  Guide will show that text
highlighted;  when you click on it,  you'll get a glossary definition.

   Some datasets store data as special flags.  For example, in the
quasar data,  column 22 can contain an "A",  "O", "R",  or just a blank
space. Each flag has a meaning.  The following lines in the .TDF file
translate:

~d~~r 22 0 A Position is of low accuracy\n
~d~~r 22 0 O Position was found optically,  and is good to 1" or better\n
~d~~r 22 0 R Position was found by radio,  and is good to 1" or better\n

   As it stands,  nothing is shown if column 22 is blank,  but using

~~r 22 0   Position is not of low accuracy\n

   (or something similar) would fix that problem.

20d: Adding note files for .TDF datasets        

   It is also possible to add note files for a .TDF dataset. There is
only one example available,  for the Binary Star data (BINORBIT.DAT),
the last dataset defined in CD_DATA.TDF.

   You'll notice that the format description for BINORBIT contains this
line:

~~n  2  15 binorbit.not

   In plain language,  this means "Notes for this dataset are found in
the file BINORBIT.NOT,  and are indexed using the fifteen characters
found starting at byte #2 in lines from BINORBIT.DAT."

   This example was chosen because the binary orbit dataset already
provided notes for most of the stars,  indexed by their RA/dec values
(which are given in BINORBIT.DAT in columns 2-16).  You will see that
the .NOT file itself is of the sort common in Guide:  the object is
specified with a tilde (~~)  plus the object identifier,  and then
text is given for that object.

21: Adding your own notes for objects     

   Not many people will have a need to add their own datasets, except
for some special-purpose projects.  A more common wish is to add some
comments for an object.  If you know how to use a text editor,  this is
quite simple to do.

   For example,  let's say that you have just observed NGC 253,  and

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