Frequency maps for stellar particles that oscillate between prograde and retrograde orbits with respect to the bar during six analyzed snapshots. In the top panel, we see a frequency map similar to the one in Figure 13 with blue circles (snapshot at 5 Gyr), green squares (snapshot at 7 Gyr) and red triangles (snapshot at 9 Gyr). The bottom panel depicts frequency maps like the one in Figure 14, with purple circles (snapshot at 6 Gyr), brown squares (snapshot at 8 Gyr), and pink triangles (snapshots at 10 Gyr).