Beaming factor f_Ω versus the pulsar spin-down power Ė evaluated for RQ (top panel) and RL (bottom panel) pulsars . The lines represent the best power-law fits to the data points; the best fit power-law parameters with relative 1σ errors, are listed in Table 8. Hereafter the optimum-solutions that are better than the other models by more than 1σ will be plotted as light-colour-filled hexagrams.