Alert Time at Earth for different CME events. All the CMEs have an initial speed of 750 km s⁻¹. The delay is measured as the difference between the time of the maximum of |V B _z | recorded at the position of the HENON virtual spacecraft and the corresponding time measured at Earth. Squares and circles represent RUN1 and RUN2; crosses and pentagons represent RUN3 and RUN4; diamonds and triangles represent RUN5 and RUN6 (see legend CME parameters). The colour of each symbol indicates the spacecraft geocentric longitude (see legend).