Strength of b/p, S​_b/p (top panel), and extent of b/p, R_b/p (bottom panel), calculated using thin+thick disc particles, at t = 9 Gyr shown as a function of thick-to-total mass fraction (f_thick) and for different geometric configurations. With increasing f_thick value, the b/ps progressively become weaker and larger in extent, and this trend remains true for all three geometric configurations considered here. The errors are calculated by constructing a total of 5000 realisations by resampling the entire population via a bootstrapping technique (for details, see text).