Two-dimensional photometric decomposition of the r-band image of the NGC 7556. The upper panels (from left to right) show the map of the observed, modeled, and residual (observed−modeled) surface brightness distributions. The field of view is oriented with North up and East left. The black areas in the residual image correspond to pixels excluded from the fit. The lower panels (from left to right) show the ellipse-averaged radial profile of surface brightness, position angle, and ellipticity measured in the observed (black dots with gray error bars) and seeing-convolved modeled image (green solid line) and their corresponding difference. The intrinsic surface-brightness radial profiles of the best-fitting spheroid (blue dashed line) and halo (red dotted line) components are also shown in both linear and logarithmic scale for the distance to the center of the galaxy.