E1: Start with the default setting and watch the full range of bifurcation appear. Be patient;  there is a lot of calculation to be done! Study the structure and define interesting areas.

E2: Zoom the r range to an interesting area and increase the window to full screen size. Start. Repeat zooming.

E3: Realize that the "empty" bands contain bifurcations, and that there are extremely narrow, seemingly empty bands, that are not recognized at low resolution.