Outcome of the algorithm for different age cuts. The left panels show groups of Cepheids identified via HDBSCAN in the t-SNE space. These groups are then displayed in the (θ, ln r) plane (middle panels), where θ is the Galactocentric azimuth and ln r the logarithm of the Galactocentric radius (corrected from the warp), and in the Galactic plane (right panels), where the Galactic center is located at (0,0). The groups have been identified in different subsamples of the original Cepheid catalog by applying different age cuts, from Cepheids younger than 100 Myr (top row) to Cepheids younger than 180 Myr (bottom row).