Fig. 3
Top panel: comparison of the input ellipticity (solid line) and the estimate (similar as Fig. 2). The plus points show the average estimate for 20 realizations without noise. The other are the result from data with intrinsic noise. All the result are calculated from Eq. (14). The stars are calculated when flexion ratios higher than the upper limit (Eq. (11)) are excluded. Bottom panel: fractional error |δϵ/ϵ| of our estimate for the respective cases.
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