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[fitsbits] substring array convention
One of the changes that was made in the new 3.0 version of the FITS
Standard document was to delete Appendix B, which described 2 conventions for storing arrays of strings in a FITS binary table. The rational for deleting this appendix was that it would more appropriate to document these conventions in the Registry of FITS Conventions, which I intend to do soon. One question, however, is whether both of these conventions have actually been used. I know that the simpler convention, e.g., TFORMn = '120A20' has been used (in this case, it means that the 120 character string consists of 6 substrings that are each 20 characters long). The other, more complex convention has 2 variations. The first form, which is equivalent to the above example, is TFORMn = '120A:SSTR20' The other variation is TFORMn = '120A:SSTR20/032' which signifies that the 120 character field consists of variable-length substrings where each substring has a maximum length of 20 characters and is terminated by the ASCII character 32 (which happens to be a space character). Does anyone know whether this more complex convention has been used in any real FITS files? If so, I'd like to get an example file. Bill -- __________________________________________________ __________________ Dr. William Pence NASA/GSFC Code 662 HEASARC +1-301-286-4599 (voice) Greenbelt MD 20771 +1-301-286-1684 (fax) |
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