Maximum dynamic pressure divided by the cosine of radiant zenith distance as a function of photometric mass for 822 fireballs. The light gray symbols represent the pressures without the cos z factor for the same fireballs. Solid lines represent the dependency on the cube root of mass (m^1/3) for the bulk of the data, the upper envelope (the strongest meteoroids), and the lower envelope (the weakest meteoroids). Dashed lines show dependencies on m^1/2 and m^1/4 for comparison. These dependencies do not correspond to the data.