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The fourth data release of the Kilo-Degree Survey:<i>ugri</i>imaging and nine-band optical-IR photometry over 1000 square degrees
Context . The Kilo-Degree Survey (KiDS) is an ongoing optical wide-field imaging survey with the OmegaCAM camera at the VLT Survey Telescope, specifically designed for measuring weak gravitational lensing by galaxies and large-scale structure. When completed it will consist of 1350 square degrees imaged in four filters ( ugri ). …