Significance of hyperbolic orbits in the FRIPON, GMN and CAMS meteor databases. Panel a shows the fraction of hyperbolic events as a function of the confidence level expressed as N_σ, which represents the number of standard deviations used to define the confidence interval in the Kresáks’ diagram. The coloured curves represent the fitting of Eq. (3) over the results of each database. Panel b displays the fraction of meteors associated with known meteor showers belonging to the hyperbolic subset as a function of N_σ.