Dependence of the ratio of the radiant intensity at 589 nm (Na I − 1) and radiant intensity at 517 nm (Mg I − 2) on the velocity. All meteors are marked according to their absolute magnitudes. Monte Carlo fits of meteors slower than 25 km s⁻¹ (red dashed line) and faster than 25 km s⁻¹ (blue dashed line) are shown. Uncertainties of these fits are shown as red and blue colored regions.