Example of the time evolution in the gas phase of the disc (runf5-1). Top panel: evolution of the mass of the embryos. Next panel down: decay of their orbits through type-1 migration, which only comes to a halt as embryos approach the inner edge. Bottom two panels: evolution of the eccentricity and inclination, respectively. In the last panel, the blue line corresponds to the opening angle of the gas scale height with respect to the midplane, and similarly the red curve shows the opening angle of the particle layer.