Images and visibilities of data preparation steps for IRAS 4A-SE. Top: imaged data; bottom: binned real and imaginary visibilities. From left to right: a) raw data; b) envelope model; c) raw data with envelope subtracted; d) raw data with envelope and companion subtracted. The contours start at 3σ, then in steps of 7σ until 31σ, and then in steps of 31σ, where σ = 10 mJy (5 mJy for envelope model image).