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Select the SAULT mode. It uses the method published by Sault, Staveley-Smith and Brouw Astron. Astrophys. Supp Ser 120, 375-384 (1995). In the Sault et al method, each field is imaged with a smaller map size than the Sky mosaic, before being combined together. This mode is better suited for large mosaics, using less memory and more accurate (less edge distortion effects) than the GUETH method.