Two figures that should have been printed in colour were inadvertently printed in black and white. These figures are reproduced below. Figure 18. Double detection: two neprofiles taken at the same time, i.e. Δt= 0 µs, with cameras 1 (red) and 2 (green). The bias bneand the statistical deviation εnebetween the profiles lie well within the error bars (see figures 20 and 22). Figure 24.Double-pulse TS measurements of the discharges in figure 23. (a) peprofiles taken with Δt ≈ 1.1τMHD. The first pulse is plotted in red and the second in green. The m/n= 2/1 islands around | z | = 80 mm reproduce very well in the profiles. (b) Δt ≈ ½τMHD. Here the O-point of the m/n= 2/1 island rotates from showing its O-point (red) to showing its X-point (green). (c) t ≈ ½τMHDas well. The m/n= 2/1 island here rotates from showing its X-point (red) to showing its O-point (green). All three discharges show a reproducing odd mode: (a) and (b) at z = +45 mm and (c) at z = -45 mm.