Reconstruction of the source based on counterimage 12 in system 5. This is the only counterimage that shows the full morphology of the arc. All other counterimages show only portions of the arc. In gray we show the source surface brightness. The blue background indicates magnification. The masked region corresponds to a diffraction spike from a nearby star. The original data is shown in the bottom right part of the figure. The blue line in the image showing the original data indicates the position of critical curve at the redshift of the source.