Structure of the inner disc for the Kepler-38 system with an embedded planet for different disc parameters. The surface density is colour-coded, since the absolute density values are not important for the disc structure we omit the density scale for clarity (brighter colours mean higher surface densities). The disc structure is shown after 225 000 binary orbits. The binary components and the planets are marked with black dots. The direction of pericentre of the secondary (green), the planet (blue) and the disc (orange) are marked by the arrows. Additional fitted ellipses to the central cavity are plotted in dashed white lines and the actual orbit of the planet is shown as dashed blue line. Using the fitted ellipses, the size and eccentricity of the disc gap, shown in the upper left edge of each panel, are calculated at the same time.