Fig. 1.
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Isodensity contours for an SIE mass profile (grey dashed line) and an SIE + fourth-order multipole mass profile (black plain line). The multipole component has a strength a4 = 0.01 (top), a4 = 0.03 (middle), or a4 = 0.05 (bottom) and is oriented along the SIE main axis to create a discy profile (left), or at 45° to the SIE main axis to create a boxy profile (right).
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