Variation of the b/p morphology with varying thick-disc mass faction (f_thick). Top left panels: density contours of edge-on stellar (thin+thick) distribution (with bar placed along the x-axis) in central region at t = 9 Gyr for models rthickE0.1 and rthickE0.9. For the rthickE0.1 model, the contours display more prominent X-shaped feature, whereas for the rthickE0.9 model, the contours display more prominent box-shaped feature. Bottom left panels: density profiles (normalised by the peak density value, and in log-scale) along bar major axis, calculated at different heights (from |z| = 0 to 6 kpc, with a step-size of 1 kpc) from mid-plane, for models rthickE0.1 and rthickE0.9. The density profiles have been artificially shifted along the y-axis to show the trends as height changes, and they do not overlap. Right panel: vertical stellar density distribution (normalised by the peak density value, and in log-scale), at a radial location around peak of the b/p structure (marked by blue vertical lines in top left panels) for rthickE0.1 and rthickE0.9 models.