The HST Key Project galaxies NGC 1326A, NGC 1425, and NGC 4548: New variable stars and massive star populationZ. T. Spetsieri, A. Z. Bonanos, M. Yang, M. Kourniotis and D. HatzidimitriouA&A, 629 (2019) A3DOI: https://doi.org/10.1051/0004-6361/201936074