Radial speeds as a function of the SXR flux maximum (SXR_max). In the two panels, elements in grey come from Fig. 2 of Salas-Matamoros & Klein (2015): dots represent CME speeds from SoHO/LASCO catalogue and the grey line is the best fit for them, given by Eq. (6). Panel a: ⟨V_R⟩ (orange dots) from our sample and V_LASCO (blue points) from Salas-Matamoros & Klein (2015) shifted because of the correction factor on SXR flux, according to GOES new science-quality data. The orange line corresponds to Eq. (7) and is the best fit for blue and orange points with a CC of 0.62. Panel b: With pink dots, V_R, max from our sample and with purple dots, V_{LASCO, corr}. V_{LASCO, corr} is the same as precedent V_LASCO, but with a correction on the speed of quasi-limb events according to Eq. (3) to recover an estimation of the real 3D radial speed of the CME. The pink line corresponds to Eq. (8) and is the best fit for purple and pink points with a CC of 0.65.