Contour plots for the X-ray cluster example in Section 3.2 showing the central region of the high SNR true β profile (top left), one noisy realization of it (lower left), a pixon-inferred truth (top right) and the ML-inferred truth (lower right). The contour levels are 0.5,1,3,10,30 (bold), 70,150 and 300 count pixel⁻¹ and the scales on the axes are numbers of pixels.