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The Dartmouth Stellar Evolution Database (sometimes abbreviated DSED) is a database relating stellar age to fundamental stellar parameters (mass, luminosity, effective temperature, and surface gravity), and filtered magnitudes under numerous photometric systems, essentially specifying the location of isochrones on an H-R diagram. The project to produce and maintain it is the Dartmouth Stellar Evolution Program (DSEP) and isochrones based on it are called Dartmouth isochrones (or DSED isochrones or DSEP isochrones).