Maximum dynamic pressure divided by the cosine of radiant zenith distance and cubic root of mass as a function of entry velocity for 822 fireballs. Solid lines represent the dependency on the 1.5th power of velocity (v^3/2) for the bulk of slow fireballs, the upper envelope (the strongest meteoroids), and the lower envelope (the weakest meteoroids). Dashed lines show dependencies on v² and v for comparison. These dependencies do not correspond to the data.