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![Projection setup and keystone effects: (a) requires long projection... | Download Scientific Diagram Projection setup and keystone effects: (a) requires long projection... | Download Scientific Diagram](https://www.researchgate.net/publication/225238306/figure/fig4/AS:302700471308291@1449180824847/Projection-setup-and-keystone-effects-a-requires-long-projection-distance-b-by-using.png)