XY distribution of the dynamically young Cepheids, overplotted with the arms from all considered azimuth ranges. The red curve corresponds to the Scutum arm, the blue curve shows the Sagittarius-Carina arm, the gold curve shows the Local (Orion) arm, and the green curve shows the Perseus arm. The dashed black curve is an arm detected by Levine et al. (2006) in the HI. For an interactive version of this plot see https://gaia-unlimited.org/map-of-milky-way-cepheid-variables/