eBETIS sample. The images correspond to the binned Hα emission line maps obtained in Sect. 2. Each image is rotated PA-90,° with the white arrows indicating the direction of the celestial north and east in the original image. The ellipse fitting of the galactic plane (see Sect. 2) is coloured in grey scale. The contrast between the galactic plane and the extraplanar gas reveals the complexity of the ionised extraplanar gas, which comprises diffuse gas, filaments, and various structures.