I've loaded data from a CSV-file without problem and assigned rule-based symbols to it. These are SVG of my own design with a line thickness set at 0,2 mm (yes, I know that's thin). Everything looks fine until I export the map. What should be 0,2 mm lines become more like 2 mm, making the symbols quite useless. I've had the problem before and managed to work my way around it, but I'm afraid I don't remember how. I feel like I'm overlooking something rather obvious but have no idea what…. Any ideas?