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They open as text files after you unzip them. You can open them with excel to parse the data


I asked my local SDSS experts, and the answer is that the fourth and fifth arrays are both bitmasks. Some background: the spectra are often generated with separate exposures that are combined into one dataset. Each exposure comes with its own set of flags. When combining datasets, the question naturally arises "Do we set a flag if it appears in any of the ...

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