Luminous efficiencies of 54 events plotted over the objects’ pre-atmospheric masses with a fit through the data presented in log-log space. The events were selected according to the following criteria: (v_e − v_final)∕v_e > 80%, h_final < 70 km, and Kn < 0.01, and assuming three different sporadic densities; Blue circles: computed values of τ assuming ρ_Sporadics = 1000 kg m⁻³ with weighted least squares fit (WLS) applied to the data (solid blue line); green triangles: (same as Fig. 14) computed values of τ assuming ρ_Sporadics = 1300 kg m⁻³ with the WLS applied to the data (dash-dotted green line); Red boxes: computed values of τ assuming ρ_Sporadics = 2000 kg m⁻³ with the WLS applied to the data (dashed red line).