Fig. A.1.

Coordinate system used in calculating the acceleration field of clusters in the plane of the sky. The blue plane shows the plane of the three clusters that define the coordinate system. The x2 coordinate direction connects A2089 and A2065, the y2 coordinate is perpendicular to x2 and is in the same plane as determined by the clusters. The z2 coordinate is perpendicular to both x2 and y2.
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