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The phrase data release (DR) is commonly used in conjunction with surveys: meaning a publicly offered set of data from the survey's observations, often after follow-up clean-up, analysis and/or interpretation. If there is additional observation to be carried out and/or more analysis, there may be subsequent data releases, often identifying them as DR1, DR2, etc. After the termination of the observation effort and follow-up, a data release may be designated the survey's final data release. Many surveys make their data available in such manner, e.g., the Sloan Digital Sky Survey (SDSS).