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Left: sample of simulated 56 × 56 pixel images of strong galaxy-galaxy lenses. Along the bottom row, the first three show examples of greyscale images produced compared to the other RGB images, while the others are examples of images with decreasing signal-to-noise ratios. Right: real images of strong galaxy-galaxy lenses. Image Courtesies from top to bottom: NASA, ESA, C. Faure (Zentrum für Astronomie, University of Heidelberg) and J.P. Kneib (Laboratoire d'Astrophysique de Marseille) (top two images); Kavan Ratnatunga (Carnegie Mellon Univ.) and NASA/ESA; and NASA, ESA, A. Bolton (Harvard-Smithsonian CfA) and the SLACS Team.
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