Reduced images for the L4.5 dwarf 2MASSW 0337−1758. The top image represents the added image of all four exposures in filter F108N and the bottom one the residual image of all exposures after the SDI reduction (same as in Figures 2 and 3). In the middle panel, the left inlay displays the residual image at position 1 on the detector, while the right displays the residuals at position 2. The clearly remaining positive signal is visible in all three residual images and thus any contamination by a bad pixel can be ruled out. The brightness difference in the final image is Δ  F108N = 3.88 mag. The orientation of all inlays is the same and the north direction is indicated by the arrow.