Fig. 4.
Spirals induced by the three putative planets, GG Tau Ac (black), GG Tau Ad (cyan), and GG Tau Ae (blue). The white ellipses indicate the approximate inner and outer edge of the dust ring. The peak brightness has been multiplied by 
and the color scale is saturated to optimize the visibility of spiral patterns. Contours are given where the color is saturated.
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