Width of the chaotic zone = (a_cav − a)∕a as a function of the mass ratio to the star of a substellar companion carving the disk cavity of HR 2562 for several eccentricities according to the relations in Lazzoni et al. (2018). The vertical dashed lines delimit the brown dwarf mass regime and the horizontal dashed lines show examples of chaotic zone width for two (disk cavity radius, companion semi-major axis) couples.