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What are PDS Archives? / What is a Data Set?

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Planetary science data stored in PDS are organized by data sets.  A data set is a collection of related data products, usually data products acquired by a particular instrument and processed in a certain way.  Each data product within a data set is of a given product type and has a unique product id.  The data set also includes all documentation and supporting materials needed to understand and use the data products.  Data sets are stored in volumes.