Comparison of different methods for measuring the b/p extent. Top panel: Profiles of function D_g(x, z) (see Eq. (B.1)), calculated at three different times for model rthickE0.5. The horizontal dotted line denotes the zeros of the function D_g(x, z) (for details, see text). Bottom panel: Correlations between size of the b/p, L_b/p and the b/p length R_b/p for the model rthickE0.5. A straight line of the form Y = AX + B is fitted (black dashed line), and the corresponding best-fit parameters are quoted. The Pearson correlation coefficients are quoted (see top right). Here, R_d, thin = 4.7 kpc.