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Figure 41: (a) The four images of the quasar Q2237+030 (known as the Einstein cross),
gravitationally lensed by an isolated bulge-disk galaxy known as Huchra’s lens [197]. © ESA’s faint
object camera on HST. (b) The empty squares denote the four observed positions of the images, and
the filled square denotes the MOND-fit unique position of the source [419]. The critical curves for
which |