Line ratio maps of NGC 4569 and associated uncertainties. Upper left: R₂₁ with black contours ranging from 0.3 to 0.7 in steps of 0.1 and white contours at 0.8 and 0.9. The beam (2.3″ × 2.1″) is represented as a filled ellipse at the bottom left corner. Upper right: R₃₂ with black contours ranging from 0.1 to 0.25 in steps of 0.05, and white contours at 0.3, 0.35 and 0.4. Lower left: R₂₁ error map with black contours at 0.02, 0.03, and white contours at 0.04, 0.05. Lower right: R₃₂ error map with black contours 0.05, 0.07, and white contours at 0.09, 0.11, 0.13.