Photometric analysis of NGC 289. Results for each waveband are displayed in two pairs of adjacent panels. First panel: original image. The two red ellipses enclose the region where the sky properties are computed. Second panel: pixel intensity distribution within the sky region (black histogram). The vertical dotted line indicates the estimated sky background value. The red curve (present only in some bands) shows the best-fit sky model made by the sum of a Gaussian and a Schechter component (see M23), individually shown by dashed light blue curves. UV bands suffer from low photon counts. Third panel: image filtered with our point-source masking technique. The division in concentric rings is also shown. Fourth panel: final radial intensity profile in image units (black circles with error bars) and normalised growth curve (red dashed curve).