Boltzmann plot of Benesov meteoroid spectrum using Mg I lines. The abscissa is the energy level of the upper state in cm⁻¹ and ordinate is I/(gA) where I is the intensity in W/(cm² − μm-sr), g is the upper state multiplicity, and A is the transition probability of the upper state in s⁻¹. The flight altitude, flight velocity, nose radius, and spallation factor are the same as in Fig. 9.