Identification of the bar-supporting stars: (I) distribution of the f_R/f_x ratio for the bulge sample (RVS-black, RPM-green); (II) distribution of the f_z/f_x frequency ratios for the bar supporting stars with P_bar ≥ 50% (see text for details); (III) current galactocentric positions of the bar stars, in face-on (XY - top) and edge-on (XZ - bottom) view, colour-coded by their f_z/f_x values.