Stability of the three planetary companions of the HD 164922 system as a function of the initial eccentricity and semi-major axis. Colour scale indicates the value of the orbital diffusion speed (c_V) ranging from black, representing stable regions, to yellow, which indicates a higher degree of instability for planets with given separation and eccentricity. Nominal positions of the planets are identified with a green circle. From left to right, the planets are represented as a function of the distance from the host star.