Cuts of intensity as a function of time and position along the surge axis from 10 s resolution NRH total intensity images. Zero position is at the middle of the cut. Corresponding images during the first phase and the beginning of the second phase of the surge are given on the left of the cuts; dashed vertical lines mark the limits of the cut region. The width of the cut changes with frequency in order to cover the entire emitting region. A and B in the 445.0 MHz cut mark the two phases of the event. We note that phase A was much shorter and weaker than phase B.