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Before I completely forgot about: dg_mosaic has an issue with discrepancies of a pixel or more in mosaiced images if the input camera models have variable detector pitch. It may be that the issue is in the images themselves, as I looked extremely carefully at our code and found no issues with it. To be looked into at some point. Testcases: WV02_20101228_1030010008CEF200_1030010008B2C800 and WV02_20110116_1030010008193700_103001000889B700