A comparison between conventional EFC and iEFC. The left figure shows the post-coronagraphic image of EFC and the middle figure shows the post-coronagrahpic image of iEFC. The distribution of the contrast as a function of time is shown on the right. The blue and red line show the results for EFC and iEFC, respectively. The various line styles represent different quantiles; the dashed lines represents the 1 and 99% quantiles, the dotted lines follow the 16 and 84% quantiles and the solid line is the 50% quantile (median contrast). Both methods converge within 10 iterations to the same median contrast of a few times 10⁻¹⁰. The 99% quantile shows that iEFC has several brighter pixels than EFC.