HR diagram containing all 1276 Am and Fm stars studied using TESS and Gaia data. The typical error bars for our stars are shown in the lower left part of the plot. Constant stars are shown in white. Binary systems are highlighted with a star-shaped symbol. The pulsation type is colour-coded according to the following colour scheme; red: γ Doradus, blue: δ Scuti, purple: hybrids. The ρ Puppis stars are also indicated with an orange half-circle. We show the γ Doradus instability strip from Dupret et al. (2004) in black dashed lines for α = 2. The δ Scuti instability strip is from Murphy et al. (2019), and is plotted with solid black lines. We include evolutionary tracks to facilitate the interpretation of the figure, which are based on Warsaw- New Jersey models assuming no rotation and solar metallicity (Dziembowski 1977; Pamyatnykh et al. 1998; Pamyatnykh 1999).