[fitsbits] Storing PDF and other graphics binary files in FITS {External}

[jaffe]

For an interferometric application I am storing the binary data in the 
so-called OI-FITS convention of FITS.  But on the side I am generating 
rather complicated graphics files for my users, in this case in PDF.  I 
would like to store the .pdf file as a table in the same FITS file.  Is 
there a conventional way of doing this?  I could create a 1 row binary 
table with the entire PDF file as the single column, but this could be 
several megabytes and might bother some reading or writing routines.

Is there any need to create a "GRAPHICS" extension to FITS?

Walter