angle, and brightness. See Table 1 for the observations log, where we also include the first VLT imaging observation from June 2004, which we re-reduced here.

All observations were done with the European Southern Observatory (ESO) Very Large Telescope (VLT) instrument Naos-Conica (NACO; Rousset et al. 2003) in the K$_{\rm s}$-band around 2 $\mu$m: 200 images (NDIT) with 0.347 seconds (DIT) each, the shortest possible integration time, all added up automatically to one frame (without moving the telescope). We then took 15 frames (NINT) with GQ Lup on slightly different positions (jitter or dither technique), but 18 frames in May 2005 and 27 in June 2004. We always used the S13 camera (pixel scale roughly 13 mas/pixel) and the double-correlated read-out mode. For the astrometric calibration binary HIP 73357, observed within one hour[^2] of the GQ Lup observations with the same set-up, we took five frames, i.e., five jitter positions with $200 \times 0.347$ seconds each (but six such images in May 2005 and four each in May and July 2006). For the raw data reduction, we subtracted a mean dark from all the science frames and flats, then devided by the mean normalized dark-subtracted flat and subtracted the mean 