Sunburst Arc main deflectors. The upper left panel shows a composite HST image of the two northern segments of the Sunburst Arc. The positions of the main deflectors are marked with green circles of radius 0.8″. The regions indicated with colored rectangles around them are enlarged in the other panels. The multiple images of all families of knots belonging to Sys-5 are marked in blue, while the model-predicted critical lines are shown in red.