Semi-major axis (au) versus eccentricity heat map, marking the differences in concentration of fireballs detected by the EFN on JFC-like orbits (Borovička et al. 2022b) for fireballs of less than one second and greater than one second. Blue areas indicate regions where <1 second fireballs have a higher concentration of data points compared to the number of fireballs >1 second, and the red is the inverse.