Top panel: polar map of the Galactic plane depicted by known (blue filled circles) and newly discovered (red filled circles) DCEPs (pulsating in any mode). The Galactic centre is in the middle; the circles have radii of 10, 20, and 30 kpc, respectively. A yellow disc represents the position of the Sun. We note that the Galactocentric polar coordinate Φ is 0° in the direction of the Sun. Bottom panel: distribution of the distances from the Galactic plane (Z) as a function of the Galactocentric distance (R_GC) for different intervals of Φ. The warping of the disc is clearly visible.