Estimate of the symmetry level. Top panels: on the left is plotted the ξ parameter at 2.18 μm with a ring of radius r1 < r < r2 = 0.92″ where we computed a mean value. On the right we plot the difference of the initial (0°) and 90° rotation images where we cut a small window to assess a mean residual value. The ratio between the mean residual value and the mean value give us a level of symmetry. Bottom panels: same process at 1.64 μm with a ring of radius r1 < r < r2 = 1.1″. The scale intensity is logarithmic.
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