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PHAT, for Panchromatic Hubble Andromeda Treasury was a survey of stars in Andromeda (M31), with observations by Hubble Space Telescope (HST) WFC3 and ACS/WFC, with observations in 2010-2011. PHATTER, for Panchromatic Hubble Andromeda Treasury: Triangulum Extended Region was a subsequent analogous effort for Triangulum Galaxy (M33), with observations in 2017-2018.