Surface brightness expressed in mag/arcsec² as measured in the H band (top) and Ks band (bottom). Red and blue lines stand for the NE and SW sides, respectively. Dotted lines show the disk intensity dispersion at 1σ within the slit window of 0.25′′. The black line indicates the noise level measured out of the slit window. Dashed lines correspond to the fitted power-law profile next to which the slopes are indicated.