Line ratio maps of NGC 4826 and associated uncertainties. The crosses are the same as in Fig. 6. Upper left: R₂₁ with black contours at 0.4, 0.5, 0.6, 0.7, 0.8 and white contours at 0.77 and 0.9. The beam (2.6″ × 1.9″) is represented as a filled ellipse at the bottom left corner. Upper right: R₃₂ with black contours at 0.1, 0.2, 0.3 and white contours at 0.4 and 0.5. Lower left: R₂₁ error map with black contours at 0.02, 0.03 and white contours at 0.04 and 0.05. Lower right: R₃₂ error map with black contours at 0.05, 0.07 and white contours at 0.09 and 0.11.