The Optical Gravitational Lensing Experiment. OGLE-III Photometric Maps   of the Galactic Disk Fields
  We present OGLE-III Photometric Maps of the Galactic disk fields observed during the OGLE-III campaigns for low luminosity transiting objects that led to the discovery of the first transiting exoplanets. The maps contain precise, calibrated VI photometry of about 9 million stars from 21 OGLE-III fields in the Galactic disk observed in the years 2002-2009 and covering more than 7 square degrees in the sky. Precise astrometry of these objects is also provided. We discuss quality of the data and present a few color-magnitude diagrams of the observed fields. All photometric data are available to the astronomical community from the OGLE Internet archive. 
M. K. Szyma\'nski, A. Udalski, I. Soszy\'nski, M. Kubiak, G.   Pietrzy\'nski, R. Poleski, {\L}. Wyrzykowski, K. Ulaczyk
astro-ph.SR