Fraction of polar discs (F_p, leftmost column) and mean orbital eccentricity of systems hosting polar discs (〈e〉, central column) for binary system population (top row) and triple system population (bottom row). As shown by the rightmost column, each point of the α−σ_β parameter space is uniquely characterized by a pair of F_p and 〈e〉 (crossing of two contour lines, red contour for polar fraction, black contour for mean eccentricity).