Comparison of the cumulative flux density distribution of meteoroids computed thanks to the observations of meteors by the Mini-EUSO telescope, resulting from the application of different methods to compute the pre-atmospheric mass of the meteoroid from the intensity of the observed meteor and consisting of different formulations of the luminous efficiency as a function of the pre-atmospheric speed V_∞, according to the literature. These are: (a) Robertson & Ayers (1968); (b) Verniani (1973); (c) Ceplecha & McCrosky (1976); (d) Halliday et al. (1996), (e) Hill et al. (2005); and (f) Weryk & Brown (2013). In each panel, coloured squares plot the results of Mini-EUSO for mass bins associated with an overall trigger efficiency ∊ > 20% and the thick coloured line reports the result of a linear fit in the log-log space. For panel a, the linear fit is made against the whole range of masses, while for panels b-f it is made against the half interval of larger masses and extended to the whole range in order to enhance its visibility. The fitted value of the mass index s for each case is reported in the corresponding panel. In all panels, the black dashed line plots the flux estimated from Grun et al. (1985) for which s = 2.34.