Minimization of the difference between shock observations (blue histogram, Wang et al. 2010) and the 3D ellipsoidal model (Sect. 2.1). a) The difference function is defined by Eq. (6) and is plotted as a function of the aspect ratio b/a. b) The theoretical probability for the shock shape described by Eq. (2) and least-squares fitted to the observed distribution is shown for four values of the aspect ratio c/b (=1 for the axisymmetric case). Here, b/a is defined by the minimum of diff(obs.,mod.) of panel a) with the curve of the same color.
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