Coronagraphic focal planes after iEFC for several different bandwidths. The lowest bandwidth is effectively monochromatic and the largest bandwidth is 40%. A rectangular dark hole was created that spans the area from −15 λ/D to 15 λ/D in the vertical direction and from 2 λ/D to 20λ/D in the horizontal direction. The majority of the controlled area stays below 5 × 10⁻⁹ at all bandwidths. At large spectral bandwidths the performance at the edges start to degrade.