Fig. A.1.
Visualization of an elongated Moffat (colour map), its elliptical level curves (white), and the ellipse 𝔼(Rx, Ry) inside which the integral is computed. Dashed circles of radius Rx and Ry help to visualize the error done when computing the integral over the ellipse instead of a circle. A very elongated Moffat is shown here (αx = 1.5αy).
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