Radio emission efficiency (L_R = L_9 GHz/P_Jets) vs. X-ray emission efficiency (L_X = L_{3 − 9 keV}/P_JED) during the outbursts of GX339-4. The blue points are the rising phases. The red points are the decaying phases. The symbols distinguish the different outbursts: diamonds for 2002, squares for 2004, dots for 2007, and triangles for 2010 (filled for the quasi-simultaneous observations and empty for the interpolated radio fluxes). We highlighted the five observations (labeled a to e) presented in Fig. 2 to provide the chronological evolution of an outburst.