Fig. 4.
Difference of the logarithms of the ionisation fraction for neutral (a) and ionised (b) hydrogen atoms with respect to the values provided under the hypothesis of ionisation equilibrium at t = 19.7 min. The magenta line shows the trajectory of the CME on the plane of sky. Also, the blue and red asterisks denote the positions of the magnetic flux rope and of the CME front at this time, respectively.
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