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Grant,
I suppose it all depends on how much a person wants to know about the objects that they are looking at.
For instance, in the aforementioned catalog, we can find the nugget of information that NGC 6522 and NGC 6528 are in a low extinction window which does not have most of the interstellar dust that usually completely hides the very centre of our galaxy from us, and that both of these clusters are right near to the centre of our own Galaxy.
cheers,
Robert
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