Fig. 1.
Left: examples of strong gravitational lens systems mocked up by painting COSMOS lensed sources on PS1 stack images, and used as positive examples for training. Right: PS1 postage stamps of a subset of the 90 000 galaxies used as negative examples, including face-on spirals, massive LRGs, and field galaxies with similar gri colors as the mocks. All postage stamps are 20″ × 20″.
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