Hello,
for convenience I might ask the CCP4BB: does anyone know what the status of
the PDB is with regard to the storage of diffraction images? I had the
impression that this matter had been discussed as far back as ~15 years ago
but what came out of it?
Short of storing images, which is the ultimate preservation of primary
information, I have always been puzzled by the fact that the PDB only stores
unique reflections i.e. no Friedel pairs even when provided. Is this outdated
perhaps ? I remember that my deposited SFs in the past where reduced to not
contain Friedel pairs. If there had been a concern about increasing the
storage space by actually less than twice the space for unique SFs, this may
be invalid today and is still far less than the space required for images.
However, it is possible that the information content in Friedel pairs is
deemed insignificant compared to their extra costs. I for one would appreciate
having access to Friedel pairs very much.
Thanks,
Lothar
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