Update README.md

README.md

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 ### Aerial Images
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-The aerial images used for colorization of FRACTAL's point clouds are made available in a separate repository: [IGNF/FRACTAL-IRGB](https://huggingface.co/datasets/IGNF/FRACTAL-IRGB).
 
+The aerial images used for colorization of FRACTAL's point clouds are made available in a separate repository: [IGNF/FRACTAL-IRGB](https://huggingface.co/datasets/IGNF/FRACTAL-IRGB).
 
 ## Citation
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