Same as Figure 2 but for the event of May 23, 2010. The numerical simulation assuming the reported parameters of the two CMEs corresponds to the green line, whereas the numerical model depicted with the amber line is obtained by reducing 75% the expelled mass during the eruptions, and 20 km s⁻¹ the ejection velocities of the CMEs. We tag each plasma in the density profiles with colored crosses: the solar wind before CME₁ in blue, the CME₁ in red, the solar wind between the CMEs in dark cyan, the CME₂ in amber and the solar wind after the CME₂ in green. We have smoothed observations of the event with a running average of 15 min, in order to be consistent with the numerical simulations. Further description of the figure is given in the text.