First instant in Fig. 5 plotted together with some magnetic field-lines (also for the standard case, and with the same colour-table). The thermal X-ray emission pattern highlights only parts of the flux-rope with low twist during the initial phases of the flare. Later on, the emission pattern fills the entire flux-rope volume, but the flux-rope will have lost much of its twist by then. Throughout the flare evolution, the most highly twisted magnetic field-lines are very rarely visible.