Astrometric and photometric uncertainties of the stars in the Galactic bar field (green box in Fig. 1) using data from GNS IDR2. Upper row: Two-dimensional histograms showing (in gray) the uncertainties estimated by the pipeline for stars of a given magnitude, combining both jackknife and PSF-based uncertainty components. The red dots show the uncertainties of stars as estimated from their multiple detections on different detector chips. Lower row: Histograms of the astrometric and photometric uncertainties of bright (H ≤ 18 [mag]) stars measured on different detectors.