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(a) and (b) Smoothed surface plots of images similar to those in Fig. 2. (c) and (d) Fits of eqn (1) to images (a) and (b), respectively. (e) and (f) Average radial line profiles from the center of the images shown in (a) and (b), respectively (symbols), and the corresponding radial slices of the axisymmetric fits shown in (c) and (d), respectively (solid lines).
