Density estimation of Fermi map. The black line (“true” density) is the KDE with bandwidth h = BW_1∕5 from a sample of the velocity u of n = 10⁶ solutions of Fermi map at t = 30. The red line denotes the KDE with bandwidth h = BW_1∕3 with its 95% CB estimated by MBB (red band) from a sample of n = 10³ solutions at the same time. The dashed blue line represents the KDE with bandwidth h = BW_1∕5 from the same sample.