The file named M33_Cepheid.cat contains data on Cepheids used in the Tsang et al. paper on Cepheids in M33. The initial catalog of Cepheid is from Hartman et al. (2006, MNRAS, 371, 1405). Some Cepheids found by Pellerin & Macri (2011, ApJ, 193, 26) have been added to that catalog. Details of the work describing the final catalog and the magnitude calibrations are in the paper by Tsang et al 2022, submitted to MNRAS